Health Information Library

All the content of the library is provided from Mayo Clinic in English.
As a member of the Mayo Clinic Care Network, RSPP has special access to Mayo Clinic knowledge and resources.

Diseases

ACL injury

Learn about this injury that affects one of the ma...

ARDS

With this condition, which can occur after a major...

Abdominal aortic aneurysm

An aneurysm in the lower part of the aorta can gro...

Absence seizure

This type of seizure produces symptoms such as a v...

Acanthosis nigricans

Learn about the causes of and treatment for this c...

Achalasia

In this condition, the muscles in the esophagus do...

Achilles tendinitis

Achilles tendinitis — Comprehensive overview cov...

Achilles tendon rupture

An Achilles tendon rupture is an injury that is us...

Acne

Learn more about this common skin condition, inclu...

Acoustic neuroma

This noncancerous tumor can sometimes grow on the ...

Acromegaly

An excess of growth hormone causes the bones to ke...

Actinic keratosis

Find out more about this skin condition that cause...

Acute coronary syndrome

Know the symptoms, causes and treatment of this he...

Acute flaccid myelitis (AFM)

Know the possible symptoms of acute flaccid myelit...

Acute kidney injury

Learn what happens when the kidneys suddenly stop ...

Acute liver failure

A rapid loss of liver function can happen in peopl...

Acute lymphocytic leukemia

Learn about this cancer that forms in the blood an...

Acute myelogenous leukemia

Learn about this cancer that forms in the blood an...

Acute sinusitis

Learn the latest ways to treat and prevent the stu...

Addison's disease

Learn about this rare but serious condition of the...

Adenomyosis

Displaced endometrial tissue from adenomyosis can ...

Adjustment disorders

These are unhealthy reactions to stress that invol...

Adrenal cancer

Learn about this rare cancer that begins in the ad...

Adrenoleukodystrophy

Find out about diagnosis and treatment of adrenole...

Adult Still disease

Learn about symptoms, complications and treatment ...

Adult attention-deficit/hyperactivity disorder (ADHD)

This mental health disorder includes a combination...

Age spots (liver spots)

Learn more about the harmless dark spots on your s...

Agoraphobia

Agoraphobia is an anxiety disorder in which you fe...

Airplane ear

That fullness in your ear when on an airplane that...

Albinism

In this group of inherited disorders, the body mak...

Alcohol intolerance

Having an immediate reaction after drinking alcoho...

Alcohol poisoning

This condition is due to drinking large amounts of...

Alcohol use disorder

Unhealthy alcohol use ranges from mild to severe, ...

Alcoholic hepatitis

Heavy drinking over years can damage the liver....

Allergies

Allergy symptoms can range from mild to severe, ev...

Alpha-gal syndrome

An allergic reaction to meat-based meals had resea...

Alzheimer's disease

Understand more about this brain disease that is t...

Ameloblastoma

Learn more about the symptoms and treatment of thi...

Amenorrhea

Absence of menstruation (amenorrhea) may be linked...

Amnesia

Read about what can cause memory loss and learn st...

Ampullary cancer

Learn more about the causes, diagnosis and treatme...

Amyloidosis

This rare disease can affect different organs in d...

Amyotrophic lateral sclerosis (ALS)

This progressive nervous system disease, also know...

Anal cancer

Learn about this cancer that affects the anal cana...

Anal fissure

Learn what causes a tear in the anus and how to pr...

Anal itching

Learn about the causes, treatment and self-care ti...

Anaphylaxis

Anaphylaxis, a severe allergic reaction, is an eme...

Anemia

Having too few healthy red blood cells causes tire...

Angelman syndrome

Learn about this genetic disorder that causes deve...

Angina

Learn about a type of chest pain caused by reduced...

Angiosarcoma

Learn about this rare cancer that begins in the bl...

Ankylosing spondylitis

Learn about this inflammatory disease that can cau...

Anorexia nervosa

People with this eating disorder have a very low b...

Anorgasmia in women

Anorgasmia is regular difficulty having an orgasm ...

Anterior vaginal prolapse (cystocele)

Anterior prolapse happens when the pelvic floor mu...

Anthrax

Learn about the symptoms and risks of anthrax, a r...

Antibiotic-associated diarrhea

Learn more about why you might get diarrhea while ...

Antiphospholipid syndrome

Learn about causes and treatment of this blood dis...

Antisocial personality disorder

This includes ignoring right and wrong, lying, tre...

Anxiety disorders

Learn the symptoms of this mental health condition...

Aortic dissection

This life-threatening condition occurs when blood ...

Aortic valve disease

Learn more about diseases that affect the valve be...

Aortic valve regurgitation

Learn more about the symptoms and treatment of thi...

Aortic valve stenosis

This type of heart valve disease reduces or blocks...

Aphasia

Some conditions, including stroke or head injury, ...

Aplastic anemia

Your body stops producing enough new blood cells i...

Appendicitis

Is it just a bellyache or something more serious? ...

Arteriosclerosis / atherosclerosis

Learn about the symptoms, causes and treatments fo...

Arteriovenous fistula

Irregular connections between arteries and veins m...

Arteriovenous malformation

In this condition, a tangle of blood vessels affec...

Arthritis

Learn about how different types of arthritis affec...

Asbestosis

Exposure to asbestos fibers causes this chronic lu...

Ascariasis

Learn more about the causes, treatment and prevent...

Aspergillosis

This fungal lung infection is caused by inhaling c...

Asthma

Find out what can trigger asthma and how to reliev...

Asthma attack

Learn how to recognize when you need to use quick-...

Astigmatism

Imperfect curvature of your eye can cause blurred ...

Astrocytoma

Learn about this type of cancer that can occur in ...

Ataxia

Often caused by an underlying condition, this loss...

Atelectasis

Atelectasis means a collapse of the whole lung or ...

Athlete's foot

Learn about the causes, symptoms, prevention and t...

Atopic dermatitis (eczema)

Learn about the causes, symptoms and treatments of...

Atrial fibrillation

A fast, pounding heartbeat could be due to AFib, a...

Atrial septal defect (ASD)

This heart problem that is present at birth causes...

Atrial tachycardia

This type of fast heartbeat may occur after heart ...

Atrioventricular canal defect

This congenital heart defect involves a hole in th...

Atrioventricular nodal reentry tachycardia (AVNRT)

This most common type of supraventricular tachycar...

Attention-deficit/hyperactivity disorder (ADHD) in children

This condition affects children, and may continue ...

Atypical genitalia

In this rare condition, a baby's genitals are not ...

Atypical hyperplasia of the breast

Learn how a diagnosis of atypical lobular hyperpla...

Auditory processing disorder (APD)

This type of hearing loss involves the brain. Lear...

Autism spectrum disorder

Autism spectrum disorder is a serious condition re...

Autoimmune hepatitis

This type of hepatitis happens when the immune sys...

Autoimmune pancreatitis

Autoimmune pancreatitis is a relatively uncommon d...

Autonomic neuropathy

Damage to the nerves that control involuntary body...

Avascular necrosis (osteonecrosis)

A broken bone or dislocated joint can block blood ...

Baby acne

Baby acne — Comprehensive overview covers causes...

Back pain

Back pain is one of the most common reasons people...

Bacterial vaginosis

Learn about symptoms, treatments and prevention of...

Bad breath

This condition, also called halitosis, most often ...

Bags under eyes

Learn about causes, treatments and self care for b...

Baker cyst

This fluid-filled cyst occurs behind the knee and ...

Balance problems

Learn about the causes and treatments of condition...

Barrett's esophagus

Barrett's esophagus, which is linked to chronic he...

Bartholin's cyst

A Bartholin's cyst is a fluid-filled lump near the...

Basal cell carcinoma

Learn about symptoms, treatment and prevention of ...

Bed-wetting

Learn about causes and treatments of bed-wetting, ...

Bedbugs

Learn more about the symptoms, treatment, preventi...

Bedsores (pressure ulcers)

These areas of damaged skin and tissue are caused ...

Bee sting

Learn about symptoms, treatment, self-care tips an...

Behcet's disease

This rare disorder causes blood vessel inflammatio...

Bell's palsy

Learn more about this condition that causes tempor...

Benign adrenal tumors

Most of these tumors need no treatment, but some d...

Benign paroxysmal positional vertigo (BPPV)

Learn more about the symptoms, causes and treatmen...

Benign peripheral nerve tumor

Learn more about the different types of tumors tha...

Benign prostatic hyperplasia (BPH)

This common problem, also known as an enlarged pro...

Bicuspid aortic valve

This condition, present at birth, affects the valv...

Bile reflux

This digestive problem tends to develop in people ...

Binge-eating disorder

People with this condition often don't feel able t...

Bipolar disorder

This mental health condition causes extreme mood s...

Bird flu (avian influenza)

Flu viruses in other animals, such as birds, may b...

Black hairy tongue

This condition gives the tongue a dark, furry look...

Bladder cancer

Blood in the urine (hematuria) sometimes is a sign...

Bladder exstrophy

This rare birth defect occurs when the bladder dev...

Bladder stones

Minerals in your urine can crystallize if you have...

Blastocystis hominis

This microscopic organism is a parasite that can l...

Blepharitis

This often chronic eyelid condition can be difficu...

Blocked tear duct

Watery, irritated eyes may occur when your tears c...

Blood in urine (hematuria)

Lots of things can cause bloody urine. Some are se...

Body dysmorphic disorder

This mental disorder causes persistent, intense fo...

Body lice

Body lice are tiny insects that live in your cloth...

Boils and carbuncles

Learn about symptoms, causes, treatment and preven...

Bone cancer

Bone cancer most commonly affects the long bones i...

Bone metastasis

Learn about the symptoms and causes of cancer that...

Bone spurs

Joint damage due to osteoarthritis is the most com...

Borderline personality disorder

This mental health condition affects how you see y...

Botulism

This rare but serious condition can be caused by b...

Brachial plexus injury

Learn about these nerve injuries that usually resu...

Bradycardia

Find out more about the symptoms, diagnosis and tr...

Brain AVM (arteriovenous malformation)

Tangled blood vessels in the brain affect typical ...

Brain aneurysm

Learn about the symptoms that may occur when a thi...

Brain metastases

Learn about symptoms, diagnosis and treatment of c...

Brain tumor

Find out more about the different types, signs, sy...

Breast cancer

Learn about this common cancer, including informat...

Breast cysts

A firm, round lump in breast tissue could be a flu...

Breast pain

Learn about possible causes and treatments for bre...

Broken ankle

A simple misstep or twisting injury can cause bone...

Broken arm

Treatment depends on the site and severity of the ...

Broken collarbone

This common injury is usually the result of fallin...

Broken foot

This injury is painful but rarely needs surgery fo...

Broken hand

You may be at higher risk of a broken hand if you ...

Broken heart syndrome

Learn more about this temporary heart muscle condi...

Broken leg

Treatment of a broken leg depends on the location ...

Broken nose

A broken nose can cause pain, swelling and bruisin...

Broken ribs

This common injury happens most often because of f...

Broken toe

Pain when wearing shoes and difficulty walking can...

Broken wrist

The most common type of wrist fracture occurs when...

Bronchiolitis

Infection in the small airways of the lungs is com...

Bronchitis

The lining of the tubes that carry air to and from...

Brucellosis

Brucellosis is an infectious bacterial disease oft...

Brugada syndrome

Learn about the symptoms, causes and treatments fo...

Bruxism (teeth grinding)

Bruxism is a condition in which you grind, gnash o...

Buerger disease

Read about this blood vessel disease that limits b...

Bulimia nervosa

In this serious eating disorder, people lose contr...

Bullous pemphigoid

Learn about the symptoms, treatment and self-care ...

Bundle branch block

A delay or blockage in the heart's signaling pathw...

Bunions

A bunion is a bony bump that forms on the joint at...

Burning mouth syndrome

This burning sensation, without an obvious cause, ...

Burns

Learn about causes, symptoms, risk factors and com...

Bursitis

Bursitis is the painful inflammation of small, flu...

C. difficile infection

Learn more about this diarrhea-causing infection t...

COPD

This ongoing lung disease limits airflow into and ...

CSF leak (Cerebrospinal fluid leak)

Cerebrospinal fluid leaks may start in the brain o...

Calciphylaxis

Learn more about this uncommon condition that affe...

Cancer

Find out the basics about cancer, including sympto...

Canker sore

Canker sore — Learn about the causes, treatment ...

Carbon monoxide poisoning

This gas has no color, odor or taste. It can be de...

Carcinoid syndrome

Find out about skin flushing and other symptoms of...

Carcinoid tumors

Learn about these slow-growing cancers that usuall...

Carcinoma of unknown primary

In this type of cancer, healthcare professionals a...

Cardiogenic shock

Most often the result of a severe heart attack, th...

Cardiomyopathy

This disease of the heart muscle makes it harder f...

Carotid artery disease

Learn about this condition that can lead to a stro...

Carpal tunnel syndrome

Learn more about the symptoms and treatment of thi...

Cataracts

Are things starting to look fuzzy or blurry? Find ...

Cavernous malformations

Understand the symptoms that may occur when blood ...

Cavities and tooth decay

These areas in the hard surface of your teeth are ...

Celiac disease

In this digestive condition, gluten in food damage...

Cellulite

Learn more about this common skin condition that c...

Cellulitis

Find out more about this potentially serious skin ...

Central nervous system vascular malformations

Several types of this condition affect the blood v...

Central sleep apnea

Find out how a mix-up in brain signals can affect ...

Cerebral palsy

Learn about this group of conditions that affect m...

Cervical cancer

Screening with Pap tests can reduce the risk of th...

Cervical dystonia

This rare movement disorder causes neck muscles to...

Cervical spondylosis

As people age, the spinal disks in the neck shrink...

Cervicitis

Sexually transmitted infections are often the reas...

Chagas disease

Learn more about this inflammatory, infectious dis...

Charcot-Marie-Tooth disease

Learn how to spot the symptoms and how doctors tre...

Chemo brain

Learn about the memory and thinking changes that s...

Chest pain

Pain in the chest has many possible causes — and...

Chiari malformation

Learn about this brain condition in which brain ti...

Chickenpox

Learn more about preventing this once-common child...

Chilblains

Learn how to prevent and treat this seasonal skin ...

Child abuse

Child abuse includes physical, sexual, emotional a...

Childhood apraxia of speech

This speech disorder is caused by a problem with c...

Childhood asthma

The lungs and airways of children with asthma beco...

Childhood obesity

Childhood obesity can lead to various conditions, ...

Childhood schizophrenia

This severe mental disorder in children involves h...

Chlamydia trachomatis

This common sexually transmitted infection (STI) c...

Cholangiocarcinoma (bile duct cancer)

Learn about symptoms, risk factors, diagnosis and ...

Cholecystitis

Learn the causes, symptoms, complications and trea...

Cholera

Cholera is a treatable — yet potentially fatal �...

Cholestasis of pregnancy

This liver condition can occur late in pregnancy, ...

Chondrosarcoma

Learn about this rare type of cancer that primaril...

Chordoma

Find out about this rare type of bone cancer. Lear...

Choroid plexus carcinoma

This rare type of cancerous brain tumor occurs mai...

Chronic cough

A cough that lasts for weeks could be caused by sm...

Chronic daily headaches

If you have a headache most days, you might have o...

Chronic exertional compartment syndrome

Learn about this condition that causes pain and sw...

Chronic granulomatous disease

Learn about this inherited disease, usually diagno...

Chronic hives

Learn how this long-lasting skin condition that ca...

Chronic kidney disease

Learn about kidney failure symptoms, tests, diagno...

Chronic lymphocytic leukemia

Learn about this cancer that forms in white blood ...

Chronic myelogenous leukemia

Learn about chronic myelogenous leukemia symptoms ...

Chronic pelvic pain

Ongoing pain in the pelvis can be a symptom of ano...

Chronic sinusitis

Read about possible causes of lasting sinus troubl...

Chronic traumatic encephalopathy

This type of brain degeneration is likely caused b...

Churg-Strauss syndrome

This rare blood vessel disease may cause breathing...

Cirrhosis

This advanced stage of liver damage often shows no...

Claudication

Too little blood flow to the legs and arms can cau...

Cleft lip and cleft palate

When an unborn baby's face and mouth are developin...

Clubfoot

This is when a baby is born with a foot fixed in a...

Cluster headache

These painful headaches cause severe pain on one s...

Coarctation of the aorta

This heart condition is usually present at birth. ...

Cold sore

Learn more about the causes, symptoms, treatment ...

Cold urticaria

Learn more about the symptoms and treatment of thi...

Colic

Consoling a baby who cries a lot for no apparent r...

Colon cancer

Find out about symptoms and causes for this cancer...

Colon polyps

Have you had your colonoscopy? Colon polyps typica...

Color blindness

Is it red or is it green? Learn more about what ca...

Coma

Learn what can cause this state of prolonged loss ...

Common cold

This common illness of the nose and throat causes ...

Common cold in babies

This viral infection causes a runny nose and nasal...

Common warts

Find out tips for preventing and dealing with this...

Complex regional pain syndrome

Learn about this neurological condition that may a...

Complicated grief

In complicated grief, painful emotions of loss don...

Compulsive gambling

Also called gambling disorder, compulsive gambling...

Compulsive sexual behavior

Also called sexual addiction, this means being obs...

Concussion

This brain injury can cause headaches, dizziness, ...

Congenital adrenal hyperplasia

This group of inherited genetic conditions limits ...

Congenital diaphragmatic hernia (CDH)

In CDH, a baby's diaphragm — the muscle that sep...

Congenital heart defects in children

Learn about symptoms, tests and treatments for chi...

Congenital heart disease in adults

A heart problem present at birth may not cause sym...

Congenital mitral valve anomalies

These heart problems at birth cause the mitral val...

Congenital myasthenic syndromes

These rare hereditary conditions result in a probl...

Conjoined twins

If an early embryo only partially separates and tw...

Constipation

Learn how to prevent and treat infrequent or painf...

Constipation in children

Learn what could cause constipation in your child,...

Contact dermatitis

Contact with certain substances, such as poison iv...

Corns and calluses

Find out more about these hardened areas of skin t...

Coronary artery disease

Know the warning signs of this common heart condit...

Coronavirus disease 2019 (COVID-19)

Coronavirus disease 2019 (COVID-19) is an illness ...

Corticobasal degeneration (corticobasal syndrome)

Learn about this rare disease that affects brain c...

Costochondritis

This chest wall pain, caused by inflammation, usua...

Cough headaches

Often triggered by coughing and other types of str...

Cradle cap

Learn about the symptoms, treatments and home care...

Craniopharyngioma

Learn more about this noncancerous tumor that form...

Craniosynostosis

This condition results in premature fusing of one ...

Creutzfeldt-Jakob disease

Learn what can put someone at risk of developing t...

Crohn's disease

Learn about symptoms and treatment for this debili...

Croup

This upper airway infection makes it harder to bre...

Cryoglobulinemia

When atypical proteins in the blood clump together...

Cushing syndrome

High levels of the hormone cortisol in your body c...

Cutaneous B-cell lymphoma

Learn about this type of cancer that starts in the...

Cutaneous T-cell lymphoma

Learn about this type of non-Hodgkin's lymphoma th...

Cyclic vomiting syndrome

Cyclic vomiting syndrome often starts in childhood...

Cyclothymia (cyclothymic disorder)

Also called cyclothymic disorder, this mood disord...

Cystic fibrosis

This condition, passed down in families, causes da...

Cystitis

Cystitis is a condition that affects the bladder. ...

Cytomegalovirus (CMV) infection

Understand the symptoms and treatment of this comm...

Dandruff

Learn about the causes of this sometimes embarrass...

De Quervain tenosynovitis

This painful condition affects the tendons on the ...

Deep vein thrombosis (DVT)

This potentially serious condition can occur with ...

Dehydration

Dehydration is especially common and dangerous for...

Delayed ejaculation

Learn what can cause delayed or absent ejaculation...

Delayed sleep phase

Learn more about this sleep condition that causes ...

Delirium

Learn what may cause this change in mental abiliti...

Dementia

This group of symptoms with many causes affects me...

Dengue fever

Learn how to identify the symptoms of this serious...

Depersonalization-derealization disorder

This mental health condition causes you to feel li...

Depression (major depressive disorder)

Depression is a mood disorder that causes a persis...

Dermatitis

Learn about the symptoms, causes and treatments of...

Dermatofibrosarcoma protuberans

Learn about symptoms and diagnosis for this rare t...

Dermatographia (Dermatographism)

Learn about the symptoms, causes and treatment of ...

Dermatomyositis

Muscle weakness and a skin rash are hallmarks of d...

Desmoid tumors

Learn how doctors use surgery, radiation therapy, ...

Desmoplastic small round cell tumors

These rare, aggressive cancers most often form in ...

Deviated septum

Learn how uneven nostrils can cause congestion, no...

DiGeorge syndrome (22q11.2 deletion syndrome)

This condition is due to missing part of chromosom...

Diabetes

Learn more about the different types of this blood...

Diabetes insipidus

Learn more about this unusual disorder that disrup...

Diabetic coma

iabetic coma is a life-threatening disorder that c...

Diabetic hypoglycemia

Low blood sugar can make you feel awful and is pot...

Diabetic ketoacidosis

Learn more about the symptoms, treatment and preve...

Diabetic nephropathy (kidney disease)

Managing diabetes can prevent or delay this common...

Diabetic neuropathy

High blood sugar can lead to nerve damage in feet ...

Diabetic retinopathy

Good diabetes control and regular exams can help p...

Diaper rash

Learn more about the causes, prevention and home r...

Diarrhea

Learn more about what causes this common digestive...

Dilated cardiomyopathy

In this heart muscle disease, the heart's main pum...

Diphtheria

This rare but serious bacterial infection can caus...

Dislocated shoulder

This shoulder injury, which occurs in the body's m...

Dissociative disorders

These mental health conditions involve experiencin...

Diverticulitis

This common colon disease develops when small pouc...

Dizziness

People feel dizzy for various reasons. How long th...

Double uterus

Learn about symptoms, diagnosis and treatment of t...

Double-outlet right ventricle

In this heart condition present at birth, two majo...

Down syndrome

In this genetic condition, an unusual cell divisio...

Dressler syndrome

Learn about the symptoms and treatment of this con...

Drug addiction (substance use disorder)

Drug addiction affects your brain and behavior to ...

Drug allergy

Learn which medicines are more likely to cause an ...

Dry eyes

Eyes feeling dry and uncomfortable? Inadequate tea...

Dry macular degeneration

Blurred or reduced central vision could be a sign ...

Dry mouth

With this condition, also known as xerostomia, the...

Dry skin

Learn more about the causes of and self-care tips ...

Dry socket

This painful condition can happen after tooth remo...

Ductal carcinoma in situ (DCIS)

Noninvasive breast cancer often has no symptoms. F...

Dumping syndrome

People who have had stomach or weight-loss surgery...

Dupuytren contracture

This condition causes one or more fingers to bend ...

Dural arteriovenous fistulas

Learn about these rare, irregular connections that...

Dust mite allergy

Dust mite allergy can lead to year-round sniffles ...

Dwarfism

Very short stature of 4 feet 10 inches or less tha...

Dysarthria

This condition affects muscles used for speaking. ...

Dyshidrosis

Learn about the symptoms, causes and treatment of ...

Dyslexia

This learning disorder involves difficulty reading...

Dysphagia

Having trouble swallowing? Learn more about what c...

Dystonia

Find out more about this painful movement disorder...

E. coli

Most strains of E. coli bacteria are harmless, but...

Ear infection (middle ear)

These usually get better on their own, but sometim...

Earwax blockage

Learn simple steps for treatment and self-care of ...

Eating disorders

Anorexia, bulimia and binge-eating disorder affect...

Ebstein anomaly

In this rare heart defect, the tricuspid heart val...

Ectopic pregnancy

Ectopic pregnancy occurs outside the uterus, threa...

Ectropion

Ectropion is an eye condition in which your eyelid...

Edema

Learn about symptoms, causes and treatment of swel...

Egg allergy

Egg allergy can cause a serious reaction in childr...

Ehlers-Danlos syndrome

Learn about these complex genetic disorders that c...

Ehrlichiosis and anaplasmosis

Learn how to prevent and treat the tick-borne dise...

Eisenmenger syndrome

This complication of an unrepaired congenital hear...

Elevated blood pressure

If your blood pressure is slightly elevated, eatin...

Embryonal tumors

Learn about these malignant brain tumors that happ...

Emphysema

Often caused by smoking, this lung disease causes ...

Encephalitis

Learn about this potentially fatal condition assoc...

Encopresis

Encopresis, also called fecal incontinence or soil...

End-stage renal disease

When kidneys no longer function well enough to mee...

Endocarditis

Learn what causes this infection of the inner lini...

Endometrial cancer

Learn about the symptoms and causes of this cancer...

Endometriosis

Learn about endometriosis, including possible trea...

Enlarged breasts in men (gynecomastia)

Learn how an imbalance of the hormones estrogen an...

Enlarged heart

Cardiomegaly is another word for this sign or symp...

Enlarged liver

Having a larger than normal liver is a sign of a s...

Enlarged spleen (splenomegaly)

Learn about what your spleen does and what can hap...

Entropion

In entropion, your eyelid turns inward, causing la...

Eosinophilic esophagitis

Learn more about the causes and treatment of eosin...

Ependymoma

Learn about this tumor that forms from ependymal c...

Epidermoid cysts

Find out more about this usually harmless, common ...

Epidermolysis bullosa

Learn about a rare inherited disease that often sh...

Epididymitis

This inflammation of the coiled tube at the back o...

Epiglottitis

A blocked windpipe needs prompt treatment....

Epilepsy

Learn about this condition that causes seizures. F...

Epithelioid sarcoma

This rare, slow-growing soft tissue cancer tends t...

Erectile dysfunction

Understand what can cause the inability to get and...

Esophageal cancer

Learn about the symptoms, diagnosis and treatments...

Esophageal spasms

This digestive condition is sometimes mistaken for...

Esophageal varices

Learn how to spot and what to do if you experience...

Esophagitis

An inflamed, sore esophagus can make it hard to sw...

Essential tremor

Learn about this condition that causes uncontrolla...

Esthesioneuroblastoma

This cancer begins in the upper part of the inside...

Ewing sarcoma

Learn about diagnosis and treatment of this bone a...

Exercise headaches

Learn about the causes and treatments of this puzz...

Exercise-induced asthma

Regular exercise is beneficial in many ways, but f...

Eye floaters

Many people over age 50 experience eye floaters. L...

Eye melanoma

Eye melanoma is a type of eye cancer. Learn about ...

Eyestrain

Gazing for long stretches at computer or digital s...

Factitious disorder

In this serious mental health condition, people de...

Factor V Leiden

This inherited clotting disorder can increase your...

Familial Mediterranean fever

This genetic autoinflammatory disorder causes recu...

Familial adenomatous polyposis

This inherited condition leads to colon cancer. Tr...

Familial hypercholesterolemia

This inherited condition can cause extremely high ...

Farsightedness

Do you see distant objects clearly, but develop a ...

Febrile seizure

These frightening but generally harmless seizures ...

Fecal incontinence

Learn about this common issue that causes some peo...

Female infertility

Learn about infertility in women, including possib...

Female sexual dysfunction

Learn more about what causes these sexual problems...

Fetal alcohol syndrome

This condition results from alcohol exposure befor...

Fetal macrosomia

When a baby in utero grows much larger than averag...

Fever

Medications can lower a fever, but sometimes it's ...

Fibroadenoma

Learn about this common breast lump. It is not can...

Fibrocystic breasts

Learn about this condition that's common in women,...

Fibromuscular dysplasia

Learn more about this condition that can narrow di...

Fibromyalgia

This complicated disorder amplifies painful sensat...

Flatfeet

A common and usually painless condition, flatfeet ...

Floor of the mouth cancer

Learn about the symptoms of this type of cancer th...

Folliculitis

Learn more about how damaged hair follicles become...

Food allergy

For people with food allergies, symptoms can range...

Food poisoning

Learn more about foodborne illnesses that can caus...

Foot drop

Foot drop is a general term that describes a diffi...

Frontal lobe seizures

In this common form of epilepsy, the seizures stem...

Frontotemporal dementia

Read more about this less common type of dementia ...

Frostbite

Learn how to prevent cold injury to the skin when ...

Frozen shoulder

This painful condition usually begins gradually an...

Fuchs dystrophy

Fuchs dystrophy may cause eye pain and vision prob...

Functional dyspepsia

Learn about functional dyspepsia, a digestive diso...

Functional neurologic disorder/conversion disorder

This disorder includes nervous system symptoms aff...

Galactorrhea

This type of milky nipple discharge happens to peo...

Gallbladder cancer

Learn about this cancer that begins in the gallbla...

Gallstones

Gallstones are hard pieces of material that can fo...

Ganglion cyst

These fluid-filled, noncancerous lumps most often ...

Gangrene

A severe bacterial infection or lack of blood flow...

Gas and gas pains

Learn about what is normal digestive system gas, w...

Gastritis

Learn about the causes and treatments for this inf...

Gastroesophageal reflux disease (GERD)

If stomach acid washes back into the esophagus, it...

Gastrointestinal bleeding

Bleeding from anywhere in your digestive tract is ...

Gastrointestinal stromal tumor (GIST)

Learn about this type of cancer that usually happe...

Gastroparesis

This digestive condition affects muscles in the st...

Gaucher disease

An enzyme that breaks down certain fatty substance...

Gender dysphoria

Learn about the treatments that can help alleviate...

Generalized anxiety disorder

Excessive, ongoing anxiety and worry can interfere...

Genital herpes

This sexually transmitted infection can't be cured...

Genital warts

The human papillomavirus (HPV) causes the most com...

Geographic tongue

Geographic tongue may look alarming, but it does n...

Gestational diabetes

This high blood sugar disorder develops during pre...

Giant cell arteritis

Head pain and tenderness are the most common sympt...

Giardia infection (giardiasis)

Stomach cramps, nausea and watery diarrhea could i...

Gilbert syndrome

This inherited liver condition affects the liver's...

Gingivitis

Gingivitis is a common and mild form of gum diseas...

Glaucoma

Regular eye exams may catch glaucoma early and sav...

Glioblastoma

This fast-growing cancer starts in the brain or sp...

Glioma

Gliomas are the most common brain tumors in adults...

Glomerulonephritis

Learn about symptoms, causes and treatments for ac...

Goiter

Enlargement of the thyroid gland may be caused by ...

Golfer's elbow

Golfers, tennis players and others who repeatedly ...

Gonorrhea

This common sexually transmitted infection often c...

Gout

This type of arthritis can cause sudden, severe at...

Granuloma annulare

Learn about this painless skin condition mainly af...

Granulomatosis with polyangiitis

Granulomatosis with polyangiitis causes inflammati...

Graves' disease

Learn about the symptoms, causes and treatment of ...

Group B strep disease

This common bacterium, usually harmless in healthy...

Growing pains

Learn about this common condition involving leg pa...

Growth plate fractures

Growth plate fractures — This common childhood b...

Guillain-Barre syndrome

This rare autoimmune condition affects the nerves,...

H1N1 flu (swine flu)

Find out more about flu caused by the H1N1 virus. ...

HIV/AIDS

Learn more about this potentially life-threatening...

HPV infection

This common viral infection often gets better on i...

Hair loss

This common and sometimes stressful condition may ...

Hairy cell leukemia

This slow-growing cancer doesn't always need immed...

Hammertoe and mallet toe

Low-heeled shoes that leave enough room for the to...

Hamstring injury

Self-care measures, such as rest and ice, might be...

Hand-foot-and-mouth disease

Learn about the symptoms and treatment of this con...

Hangovers

Unpleasant symptoms can happen after drinking too ...

Hantavirus pulmonary syndrome

Learn about the rodent-transmitted virus that caus...

Hashimoto's disease

Learn about the symptoms and treatment of this thy...

Hay fever

Find out more about how to diagnose and get relief...

Head and neck cancers

Learn about innovative treatment for throat cancer...

Head lice

Find out how these tiny insects that feed on blood...

Headaches in children

Find out more about headaches in children, which m...

Hearing loss

Age- and noise-related hearing loss are common and...

Heart arrhythmia

Learn about common heart rhythm disorders that can...

Heart attack

A blockage of blood flow to the heart can damage o...

Heart disease

Learn about symptoms, causes and treatment of card...

Heart failure

Learn about this chronic disease that needs lifelo...

Heart murmurs

An irregular heart sound may be harmless or worris...

Heart palpitations

Know when and how feelings of a rapid, fluttering ...

Heart valve disease

Learn about this condition in which one or more of...

Heartburn

Occasional heartburn is a common, manageable condi...

Heat exhaustion

An overheated body can lead to dangerous symptoms....

Heat rash

Learn more about the symptoms, causes and treatmen...

Heatstroke

Know the signs and what to do for this dangerous i...

Heavy menstrual bleeding

Learn about the causes and treatment of heavy mens...

Helicobacter pylori (H. pylori) infection

Learn more about the symptoms, tests and treatment...

Hemangioma

This red mark on a baby's skin looks like a rubber...

Hemifacial spasm

Learn about diagnosis and treatment of this nervou...

Hemochromatosis

This liver disorder causes your body to absorb too...

Hemolytic uremic syndrome (HUS)

Damage to the small blood vessels in the kidneys c...

Hemophilia

In this inherited disorder, the blood lacks one of...

Hemorrhoids

There are many effective options for easing the di...

Henoch-Schonlein purpura

Learn about the symptoms, causes and treatment of ...

Hepatitis A

This contagious liver infection is caused by a vir...

Hepatitis B

This serious liver infection is caused by a virus ...

Hepatitis C

Many people with this infection don't know they ha...

Hepatocellular carcinoma

Learn about innovative treatments for the most com...

Hepatopulmonary syndrome

This lung condition causes low oxygen levels and s...

Hereditary hemorrhagic telangiectasia

This inherited blood vessel disorder can cause sev...

Herniated disk

This condition occurs most often in the lower back...

Hiatal hernia

A hiatal hernia occurs when part of the stomach bu...

Hiccups

Caused by spasms of your diaphragm that you can't ...

Hidradenitis suppurativa

This condition causes small, painful lumps to form...

High blood pressure (hypertension)

Learn the symptoms and treatment of this condition...

High blood pressure in children

Children can develop high blood pressure for the s...

High cholesterol

You need some cholesterol in your blood to build h...

Hilar cholangiocarcinoma

Learn about how this type of bile duct cancer is d...

Hip dysplasia

In infancy, this condition often can be corrected ...

Hip fracture

The risk of breaking a hip increases with age. Lea...

Hip labral tear

Sports such as soccer, football and golf can incre...

Hirschsprung's disease

This digestive disorder that's present at birth af...

Hirsutism

Learn more about causes and complications of unwan...

Histoplasmosis

Learn more about the symptoms and treatment of thi...

Hives and angioedema

Learn more about these common but short-lived skin...

Hoarding disorder

This mental health condition involves ongoing diff...

Hodgkin lymphoma (Hodgkin disease)

Learn how this cancer differs from other lymphomas...

Horner syndrome

Find out about Horner syndrome, an interruption in...

Hot flashes

Hot flashes are the most common symptom of menopau...

Huntington's disease

This rare disease causes an early decay of nerve c...

Hurthle cell cancer

Learn about this rare type of aggressive thyroid c...

Hydrocele

Find out more about the symptoms, causes and treat...

Hydrocephalus

Learn about this potentially fatal condition that ...

Hydronephrosis

This condition involves swelling of one or both ki...

Hypercalcemia

This condition can weaken bones, create kidney sto...

Hypereosinophilic syndrome

Hypereosinophilic syndrome is a disorder of certai...

Hyperglycemia in diabetes

Hyperglycemia in diabetes can occur for many reaso...

Hyperhidrosis

Learn more about causes, symptoms, treatment and s...

Hyperoxaluria and oxalosis

Learn about symptoms, causes, diagnosis and treatm...

Hyperparathyroidism

Learn about symptoms, tests and treatment for this...

Hyperthyroidism (overactive thyroid)

Understand what happens when your thyroid is overa...

Hypertrophic cardiomyopathy

In this condition, the heart muscle thickens, whic...

Hypoglycemia

Low blood sugar can cause uncomfortable symptoms, ...

Hyponatremia

Hyponatremia is the term used when your blood sodi...

Hypoparathyroidism

Learn more about this uncommon condition in which ...

Hypopituitarism

Learn about the symptoms and treatment of this rar...

Hypoplastic left heart syndrome

Learn more about this rare congenital heart defect...

Hypospadias

This condition happens before birth. The opening o...

Hypothermia

Learn about symptoms, treatment and prevention of ...

Hypothyroidism (underactive thyroid)

Understand what happens when your thyroid is under...

Idiopathic hypersomnia

Learn about this sleep condition that causes extre...

IgA nephropathy (Berger disease)

This disease causes kidney inflammation that, over...

Illness anxiety disorder

Excessive worry that you're seriously ill based on...

Immune thrombocytopenia (ITP)

Caused by low levels of platelets, symptoms may in...

Impacted wisdom teeth

These teeth don't have enough room to come in or d...

Impetigo

Learn about the symptoms, causes and treatment of ...

Incompetent cervix

Sometimes the cervix opens and thins early, puttin...

Indigestion

Is it indigestion or something else? Find out abou...

Infant jaundice

Learn about this common condition in newborns, esp...

Infant reflux

Learn more about this condition in which a baby sp...

Infectious diseases

Viruses, bacteria, fungi and parasites can all cau...

Infertility

Find out about the challenges of not being able to...

Inflammatory bowel disease (IBD)

Long-lasting diarrhea and belly pain could be caus...

Inflammatory breast cancer

Learn about this rare, aggressive type of breast c...

Influenza (flu)

Learn more about the symptoms, causes and preventi...

Ingrown hair

Learn about causes, treatment and prevention of th...

Ingrown toenails

Learn about causes, prevention and treatment of th...

Inguinal hernia

What happens if part of the intestine bulges throu...

Inherited metabolic disorders

Caused by gene changes, these disorders affect the...

Insomnia

This disorder can make it hard to fall asleep, har...

Intermittent explosive disorder

This mental health condition involves sudden bouts...

Interstitial cystitis

Bladder pain and urinary frequency flare with cert...

Interstitial lung disease

This group of lung diseases cause progressive lung...

Intestinal ischemia

Learn about what happens when blood flow to part o...

Intestinal obstruction

A blocked intestine needs prompt medical care. Lea...

Intracranial hematoma

This collection of blood within the skull is a ser...

Intracranial venous malformations

Find out more about the diagnosis and treatment of...

Intussusception

This rare but serious disorder occurs when one par...

Invasive lobular carcinoma

Breast cancer that begins in the milk-producing gl...

Iritis

Learn about who's at risk of this eye condition an...

Iron deficiency anemia

Iron deficiency anemia — Comprehensive overview ...

Irritable bowel syndrome

Lifestyle changes can make a big difference when i...

Ischemic colitis

Ischemic colitis happens when a part of the colon ...

Itchy skin (pruritus)

Learn about causes of this common irritating skin ...

Jaw tumors and cysts

Also called odontogenic tumors and cysts, these ty...

Jellyfish stings

Learn more about prevention and first aid for thes...

Jet lag disorder

Jetting across time zones can take a toll on your ...

Jock itch

Learn more about this common, treatable fungal inf...

Juvenile idiopathic arthritis

Learn about this type of arthritis that affects ch...

Kaposi sarcoma

This cancer caused by a virus occurs in people who...

Kawasaki disease

Learn more about this condition that primarily aff...

Keloid scar

Learn about how to prevent, remove or flatten thes...

Keratitis

An inflamed, red eye can be a minor nuisance — b...

Keratoconus

When your cornea bulges outward, it can cause blur...

Keratosis pilaris

Find out more about this harmless, nonpitch skin c...

Kidney cancer

Learn about the symptoms, diagnosis and treatments...

Kidney cysts

These round, fluid-filled pouches on or in the kid...

Kidney infection

A urinary tract infection that travels to the kidn...

Kidney stones

Learn about the symptoms, risks, causes and treatm...

Kleptomania

If you have this impulse control disorder, you can...

Klinefelter syndrome

In this condition, a genetic male has an extra X s...

Klippel-Trenaunay syndrome

Main signs of this congenital disorder involve a r...

Knee bursitis

This condition involves painful swelling of a smal...

Knee pain

Learn about this common complaint, which can resul...

Kyphosis

This excessive forward rounding of the back is oft...

Lactose intolerance

Not being able to fully digest the sugar (lactose)...

Laryngitis

Learn about the symptoms, causes and treatment for...

Latex allergy

This allergy is a reaction to proteins in natural ...

Lazy eye (amblyopia)

Abnormal visual development early in life can caus...

Lead poisoning

Learn about lead poisoning symptoms and treatment ...

Left ventricular hypertrophy

Learn more about this heart condition that causes ...

Legg-Calve-Perthes disease

This childhood condition occurs when blood supply ...

Legionnaires' disease

Bacteria that can live in water from air condition...

Leiomyosarcoma

Learn about this rare cancer that begins in smooth...

Leukemia

Learn about this cancer that forms in the blood an...

Leukoplakia

This mouth condition appears as thick, white patch...

Lewy body dementia

This common dementia is caused by a buildup of pro...

Lice

Learn how to get rid of these tiny, wingless insec...

Lichen planus

Learn about the causes, symptoms and treatment of ...

Lichen sclerosus

Learn more about the causes, symptoms, complicatio...

Lip cancer

Lip cancer often appears as a sore on your lip tha...

Lipoma

Lipoma — Comprehensive overview covers symptoms,...

Liposarcoma

Learn about diagnosis and treatment options for th...

Listeria infection

This foodborne bacterial illness can be very serio...

Liver cancer

Learn how doctors use surgery, liver transplant, r...

Liver disease

The liver has a lot of vital tasks including riddi...

Liver hemangioma

A liver hemangioma is a noncancerous mass that typ...

Lobular carcinoma in situ (LCIS)

If a breast biopsy reveals you have LCIS, your ris...

Long QT syndrome

Learn more about the causes and treatment of this ...

Low blood pressure (hypotension)

This condition isn't always a concern. But sometim...

Low sex drive in women

Many women have dips in sexual desire at some poin...

Low sperm count

This health concern can make it challenging to sta...

Lung cancer

Learn about the symptoms, diagnosis and treatment ...

Lupus

Learn how this disease can affect your joints, ski...

Lupus nephritis

Learn about this common effect of lupus on the kid...

Lyme disease

Learn about the symptoms, diagnosis and treatment ...

Lymphedema

Damaged or removed lymph nodes can affect how lymp...

Lymphoma

Cancer that forms in the germ-fighting lymphatic s...

Lynch syndrome

Learn about this condition caused by inherited gen...

MCAD deficiency

This inherited genetic disorder prevents the break...

MRSA infection

MRSA infections often occur in health care setting...

Malaria

Learn about the symptoms, causes, treatment, and p...

Male breast cancer

Breast cancer can affect anyone. Learn about the s...

Male hypogonadism

This condition affects the ability of men's bodies...

Male infertility

Male infertility often plays a role when couples h...

Malignant hyperthermia

This rare genetic disorder triggers a severe react...

Malignant peripheral nerve sheath tumors

These cancers form in the linings of nerves. Treat...

Mammary duct ectasia

Mammary duct ectasia is a noncancerous breast cond...

Marfan syndrome

This inherited disorder affects the skeleton and t...

Mastitis

Pain and swelling in the breast could be caused by...

Measles

Learn about this vaccine-preventable disease that ...

Median arcuate ligament syndrome (MALS)

Stomach pain after eating isn't always indigestion...

Medication overuse headaches

When medicines that ease headache pain are used to...

Medulloblastoma

Medulloblastoma is the most common cancerous brain...

Melanoma

Learn about the symptoms, diagnosis and treatments...

Meniere's disease

This chronic disorder affects balance and hearing,...

Meningioma

This is the most common type of tumor that forms i...

Meningitis

Spot the signs and understand the treatment option...

Menopause

Find out about this major life change and learn ho...

Menstrual cramps

Menstrual cramps — pain in the lower abdomen jus...

Mental illness

A wide range of mental health conditions affect mo...

Meralgia paresthetica

Learn about this condition that causes burning, ti...

Merkel cell carcinoma

Learn about this aggressive skin cancer. Find out ...

Mesenteric ischemia

This condition can come on suddenly or develop ove...

Mesenteric lymphadenitis

This condition involves swollen lymph nodes in the...

Mesothelioma

Learn about this uncommon cancer that's linked to ...

Metabolic syndrome

Having three or more specific risk factors, such a...

Metachromatic leukodystrophy

This rare genetic disorder causes fatty substances...

Metatarsalgia

Metatarsalgia is a condition in which the ball of ...

Microcephaly

Learn more about microcephaly, when an infant's he...

Microscopic colitis

Ongoing, watery diarrhea could be a sign of this c...

Migraine

Find out about painful migraines that can last hou...

Migraine with aura

Learn more about migraine that causes pain and sen...

Mild cognitive impairment (MCI)

Learn more about this stage between the typical me...

Milk allergy

Find out what happens when the immune system react...

Miscarriage

Learn what might cause the loss of a pregnancy, th...

Mitral valve disease

Learn more about diseases that affect the valve be...

Mitral valve prolapse

This heart condition, also called Barlow syndrome,...

Mitral valve regurgitation

Learn more about the symptoms and treatment of thi...

Mitral valve stenosis

When the valve between the left heart chambers is ...

Mittelschmerz

Some women experience pain on one side of the lowe...

Mixed connective tissue disease

Mixed connective tissue disease has signs and symp...

Molar pregnancy

This rare pregnancy complication requires early tr...

Mold allergy

Coughing, sneezing and itchy eyes often accompany ...

Moles

Moles, also known as nevi, are a common type of sk...

Molluscum contagiosum

Learn how to prevent and treat this common skin in...

Monoclonal gammopathy of undetermined significance (MGUS)

When bone marrow produces an unusual protein in th...

Mononucleosis

Learn about the symptoms and treatment of the kiss...

Mood disorders

These conditions affect emotions. Depression cause...

Morning sickness

Learn more about nausea and vomiting during pregna...

Morphea

Learn more about this rare, painless skin conditio...

Morton's neuroma

Learn how this painful foot disorder is diagnosed,...

Mosquito bites

Learn about the many ways to prevent mosquito bite...

Mouth cancer

Learn what doctors and dentists look for when diag...

Movement disorders

Learn about the different types of neurological co...

Moyamoya disease

This rare disorder occurs when blood flow to the b...

Multiple endocrine neoplasia, type 1 (MEN 1)

Learn about this rare condition that causes tumors...

Multiple endocrine neoplasia, type 2 (MEN 2)

Learn about this rare disorder that causes tumors ...

Multiple myeloma

Learn about this cancer that forms from white bloo...

Multiple sclerosis

This nervous system condition causes a range of sy...

Multiple system atrophy

This rare condition affects movement, blood pressu...

Multisystem inflammatory syndrome in children (MIS-C) and COVID-19

Learn about symptoms of MIS-C, a serious condition...

Mumps

Find out more about the symptoms and treatment of ...

Muscle cramp

Learn about this sudden, painful tightening of a m...

Muscle strains

Minor strains may only overstretch a muscle or ten...

Muscular dystrophy

Read about different types of this progressive dis...

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)

This complicated disorder may be triggered by an i...

Myasthenia gravis

A breakdown in the communication between nerves an...

Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD)

Learn about the symptoms, diagnosis and treatments...

Myelodysplastic syndromes

Learn how medications and bone marrow transplants ...

Myelofibrosis

Find out more about this bone marrow cancer. Learn...

Myocardial ischemia

Myocardial ischemia reduces blood flow to the hear...

Myocarditis

Learn about the diagnosis and treatment of this in...

Myoclonus

These uncontrollable jerking motions, which includ...

Myofascial pain syndrome

In this condition, pressure on certain points in t...

Myxofibrosarcoma

Learn about this connective tissue cancer that oft...

Nail fungus

Learn about symptoms, treatment and prevention of ...

Narcissistic personality disorder

This mental disorder includes an unreasonably high...

Narcolepsy

Learn more about this sleep condition that causes ...

Nasal and paranasal tumors

Learn about these cancerous and noncancerous growt...

Nasal polyps

These painless, noncancerous growths can lead to a...

Nasopharyngeal carcinoma

Nasopharyngeal carcinoma is cancer that happens in...

Nearsightedness

Tired of squinting at objects in the distance? The...

Neck pain

This common ailment can be the result of poor post...

Nephrogenic systemic fibrosis

Learn about symptoms, risk factors and possible tr...

Nephrotic syndrome

Swelling around your feet and ankles is a common s...

Neuroblastoma

Learn more about the symptoms, diagnosis and treat...

Neurodermatitis

Learn about this itchy skin condition that can dis...

Neuroendocrine tumors

Learn about the types of tumors that make up this ...

Neurofibroma

Learn about this type of peripheral nerve tumor th...

Neurofibromatosis type 1

This genetic condition causes tumors on nerve tiss...

Neuromyelitis optica

Understand more about this condition that affects ...

Nickel allergy

Nickel allergy, often caused by nickel in jewelry,...

Nicotine dependence

Nicotine dependence can be tough to kick, but trea...

Niemann-Pick disease

A condition passed down in families that affects h...

Nightmare disorder

Nightmare disorder involves disturbing or scary dr...

Non-Hodgkin lymphoma

Learn about the symptoms, risk factors and treatme...

Nonalcoholic fatty liver disease

This liver condition is becoming more common in th...

Nonallergic rhinitis

Many things can trigger this problem. Learn how to...

Nonmelanoma skin cancer

Learn about treatment options for all types of non...

Noonan syndrome

This genetic condition stops typical development i...

Norovirus infection

This highly contagious virus spreads through conta...

Obesity

Obesity isn't just a cosmetic concern. It is a med...

Obsessive-compulsive disorder (OCD)

OCD features unwanted thoughts and fears, or obses...

Obstructive sleep apnea

Learn the signs that point to this common and pote...

Occupational asthma

Dust, fumes and other substances at work can cause...

Ocular rosacea

Learn about symptoms, causes and treatments of ocu...

Oligodendroglioma

Learn about this type of tumor that can occur in t...

Oppositional defiant disorder (ODD)

This childhood mental health condition includes fr...

Optic neuritis

Learn about this painful eye disorder that affects...

Oral lichen planus

This chronic inflammatory condition results in whi...

Oral thrush

This infection is caused by the overgrowth of the ...

Orchitis

This infection of one or both testicles can cause ...

Orthostatic hypotension (postural hypotension)

This form of low blood pressure might cause dizzin...

Osteoarthritis

This most common form of arthritis mainly affects ...

Osteochondritis dissecans

Osteochondritis dissecans most commonly affects ch...

Osteomyelitis

Bones don't get infected easily, but a serious inj...

Osteoporosis

Fractures associated with this bone-weakening cond...

Osteosarcoma

Learn about the symptoms and causes of this bone c...

Ovarian cancer

Learn more about cancer of the ovaries, including ...

Ovarian cysts

Many women have ovarian cysts at some time. Most a...

Ovarian hyperstimulation syndrome

Learn about this possible complication of fertilit...

Overactive bladder

Learn how you can get relief for sudden urges to u...

Paget's disease of bone

Find out about this condition that can make bones ...

Paget's disease of the breast

This rare form of breast cancer causes breast skin...

Painful intercourse (dyspareunia)

Pain during sex can happen for many reasons, rangi...

Pancreatic cancer

Learn about symptoms, risk factors, prevention, di...

Pancreatic cysts

Most pancreatic cysts are benign, but some types a...

Pancreatic neuroendocrine tumors

Learn about these cancers that start in the hormon...

Pancreatitis

Pancreatitis can occur suddenly or build up over t...

Panic attacks and panic disorder

Learn about effective treatment for sudden episode...

Paraganglioma

Learn about this rare tumor that begins in nerve c...

Paraneoplastic syndromes of the nervous system

This group of conditions affects people who have c...

Parkinson's disease

There's no cure for this progressive movement diso...

Parotid tumors

Learn about symptoms and diagnosis of parotid glan...

Partial anomalous pulmonary venous return

In this heart problem present at birth, some of th...

Parvovirus infection

Learn more about the symptoms, causes, treatment a...

Patellar tendinitis

Jumper's knee — a common knee injury — affects...

Patellofemoral pain syndrome

This pain at the front of the knee is more common ...

Patent ductus arteriosus (PDA)

Learn about symptoms, causes and treatment of this...

Patent foramen ovale

Learn more about the causes and complications of t...

Peanut allergy

Peanut allergy can be serious. Find out what you n...

Pectus excavatum

Pectus excavatum causes the breastbone to sink int...

Pediatric brain tumors

Pediatric brain tumors include medulloblastoma, gl...

Pediatric obstructive sleep apnea

This condition can cause your child's breathing to...

Pelvic inflammatory disease (PID)

This serious infection of the female reproductive ...

Pelvic organ prolapse

Learn about treatment choices for this condition, ...

Pemphigus

Learn about symptoms, causes, treatment and self-c...

Penicillin allergy

Understand the importance of an accurate diagnosis...

Peptic ulcer

A dull or burning pain in the stomach could be a p...

Pericardial effusion

Learn the symptoms, causes and treatment of excess...

Pericarditis

Inflammation of the tissue surrounding the heart c...

Perimenopause

Discover effective treatments and learn self-care ...

Periodontitis

This serious gum infection damages the soft tissue...

Peripheral artery disease (PAD)

This common blood flow condition can cause leg pai...

Peripheral nerve injuries

These types of injuries affect the nerves that lin...

Peripheral nerve tumors

Learn about these growths that form in or near ner...

Peripheral neuropathy

Learn what may cause the prickling, tingling or nu...

Peritonitis

Learn about the causes, symptoms and treatment of ...

Persistent depressive disorder

This type of depression may cause you to feel sad ...

Persistent post-concussive symptoms (Post-concussion syndrome)

Find out what to do when symptoms such as headache...

Personality disorders

A person with this mental health condition thinks,...

Pet allergy

Family pet making you sneeze? Find out about diagn...

Peyronie disease

Understand what causes bent and painful erections ...

Phenylketonuria (PKU)

PKU is caused by a change in the gene that helps c...

Pheochromocytoma

Find out more about the symptoms, causes and treat...

Pilonidal cyst

Learn about causes, symptoms and treatments of thi...

Pinched nerve

Pressure on a nerve can lead to numbness, tingling...

Pineoblastoma

Learn about this rare cancer that begins in the br...

Pink eye (conjunctivitis)

This highly contagious eye condition can be itchy ...

Pinworm infection

Learn more about the symptoms, treatment and preve...

Pituitary tumors

Learn more about the symptoms, causes and treatmen...

Pityriasis rosea

Learn more about the symptoms, causes and treatmen...

Placenta accreta

During pregnancy, if part of the placenta grows to...

Placenta previa

Learn about how this pregnancy complication is dia...

Placental abruption

This uncommon pregnancy complication, in which the...

Plague

Learn about the symptoms, risk factors and treatme...

Plantar fasciitis

Learn about this most common cause of stabbing hee...

Plantar warts

Learn about the causes, treatment and prevention o...

Pleurisy

In this condition, the tissues that line the lungs...

Pneumonia

Pneumonia — Learn about the symptoms, causes and...

Pneumonitis

A general term for lung swelling and irritation, i...

Pneumothorax

A collapsed lung occurs when air leaks into the sp...

Poison ivy rash

Learn about the symptoms, causes and home remedies...

Polio

Learn more about this contagious viral illness tha...

Polycystic kidney disease

Learn how treatments and lifestyle changes might h...

Polycystic ovary syndrome (PCOS)

Polycystic ovaries, hormone imbalance and irregula...

Polycythemia vera

This slow-growing blood cancer mainly affects peop...

Polyhydramnios

Learn about the symptoms, causes and treatment for...

Polymorphous light eruption

Learn more about the symptoms and treatments for t...

Polymyalgia rheumatica

Older adults who suddenly develop muscle pain and ...

Polymyositis

The muscle weakness associated with polymyositis c...

Popliteal artery aneurysm

Learn more about this lower extremity aneurysm tha...

Popliteal artery entrapment syndrome

Calf pain cramping your style during a workout? Kn...

Porphyria

This group of disorders results from a buildup of ...

Post-polio syndrome

This syndrome causes a number of potentially serio...

Post-traumatic stress disorder (PTSD)

This mental health condition, which is caused by b...

Post-vasectomy pain syndrome

Learn about post-vasectomy pain syndrome (PVPS) �...

Posterior cortical atrophy

This rare neurological syndrome that's often cause...

Posterior vaginal prolapse (rectocele)

In this pelvic floor disorder, the rectum presses ...

Postherpetic neuralgia

This complication of shingles can cause pain, itch...

Postpartum depression

Learn the risk factors and symptoms of depression ...

Postpartum preeclampsia

Learn about this rare condition that's typically a...

Pouchitis

This condition is swelling and irritation that hap...

Prader-Willi syndrome

This rare genetic condition leads to physical, men...

Precocious puberty

Read about what can cause children's bodies to beg...

Prediabetes

Blood sugar levels start to rise even before you g...

Preeclampsia

Learn about the diagnosis, treatment of this pregn...

Premature birth

Here's what you need to know about caring for a pr...

Premature ejaculation

Understand what may cause ejaculation to happen ea...

Premature ventricular contractions (PVCs)

Premature ventricular contractions (PVCs) are extr...

Premenstrual syndrome (PMS)

Mood swings, cramps and irritability are just a fe...

Presbyopia

Have you noticed — yet — having to hold books ...

Prescription drug abuse

Using a prescription medicine in a way not intende...

Preterm labor

Going into labor before your due date is serious, ...

Priapism

Understand the symptoms, possible causes and treat...

Primary biliary cholangitis

Primary biliary cholangitis is a type of liver dis...

Primary immunodeficiency

Frequent infections could mean you have an immune ...

Primary lateral sclerosis (PLS)

This motor neuron disease causes nerves within the...

Primary ovarian insufficiency

This condition, also called premature ovarian fail...

Primary progressive aphasia

Find out more about this type of dementia that aff...

Primary sclerosing cholangitis

Liver damage can result from this potentially seri...

Proctitis

Proctitis means inflammation of the rectal lining....

Progeria

This genetic disorder is extremely rare and progre...

Progressive supranuclear palsy

Learn about this brain condition that affects your...

Prolactinoma

Learn how this pituitary gland tumor alters certai...

Prostate cancer

Learn about detection, diagnostic approaches, trea...

Prostatitis

Learn about tests and treatments for disorders of ...

Pseudobulbar affect

Pseudobulbar affect — Overview covers symptoms, ...

Pseudocholinesterase deficiency

This causes sensitivity to certain muscle relaxant...

Pseudogout

This disease mimics gout, causing sudden, painful ...

Pseudomembranous colitis

This inflammatory colon condition is usually cause...

Pseudotumor cerebri (idiopathic intracranial hypertension)

Headaches and vision loss can result from this inc...

Psoriasis

Learn about this common skin condition that causes...

Psoriatic arthritis

This form of arthritis affects some people who hav...

Pubic lice (crabs)

Pubic lice (crabs) are an itchy, but treatable, nu...

Pulmonary atresia

This life-threatening heart condition that's prese...

Pulmonary atresia with intact ventricular septum

Also called PA/IVS, this rare congenital heart def...

Pulmonary atresia with ventricular septal defect

This congenital heart defect affects the valve bet...

Pulmonary edema

Get more information about the causes of this pote...

Pulmonary embolism

A blood clot blocks and stops blood flow to an art...

Pulmonary fibrosis

Thickened and scarred lung tissue makes it hard fo...

Pulmonary hypertension

This lung condition makes the heart work harder an...

Pulmonary valve stenosis

When the valve between the heart and lungs is narr...

Pyloric stenosis

In this condition, a valve between an infant's sto...

Pyoderma gangrenosum

Learn about the symptoms, treatment and risk facto...

REM sleep behavior disorder

REM sleep behavior disorder is a sleep disorder in...

Rabies

Learn about this deadly virus that most often spre...

Radiation enteritis

This complication of radiation therapy for cancer ...

Radiation sickness

Read about what happens when someone is exposed to...

Ramsay Hunt syndrome

A shingles outbreak can affect the facial nerve ne...

Raynaud's disease

Learn how this disease causes parts of the body, m...

Reactive arthritis

This joint pain is triggered by an infection in an...

Reactive attachment disorder

Reactive attachment disorder is when an infant or ...

Rectal cancer

Learn about the symptoms, causes and prevention of...

Rectal prolapse

This rare condition happens when the rectum slips ...

Rectovaginal fistula

This open tunnel connects the rectum and vagina, a...

Recurrent breast cancer

Learn about symptoms that alert doctors to a breas...

Renal artery stenosis

Read more about what happens when the arteries lea...

Residual limb pain

This common pain in the part of a limb that remain...

Respiratory syncytial virus (RSV)

This common illness affects the lungs. It can seem...

Restless legs syndrome

Uncomfortable sensations in your legs can interrup...

Retinal detachment

Eye floaters and reduced vision can be symptoms of...

Retinal diseases

Learn about the symptoms, diagnosis and treatment ...

Retinoblastoma

Learn about the symptoms, causes and treatments fo...

Retractile testicle

Find out about this condition that allows the test...

Retrograde ejaculation

Learn about the symptoms and treatment options for...

Rett syndrome

This rare genetic disorder affects the way the bra...

Reye's syndrome

Learn about the causes and treatment of this rare ...

Rhabdomyosarcoma

This rare soft tissue cancer affects children more...

Rheumatic fever

Learn about this complication of strep throat and ...

Rheumatoid arthritis

This chronic inflammatory disorder can affect more...

Rickets

Learn what can cause this bone-softening disease i...

Ringworm (body)

Learn more on causes, symptoms, treatments of this...

Ringworm (scalp)

Learn more on causes, symptoms, treatments of this...

Rosacea

Learn about the symptoms, skin care tips and medic...

Roseola

Learn about the causes of and home-care tips for t...

Rotator cuff injury

This common shoulder disorder is often caused by r...

Rotavirus

Learn more about this common childhood condition t...

Rubella

Learn more about the symptoms and prevention of th...

Rumination syndrome

Learn about this condition that results in regurgi...

Ruptured eardrum (perforated eardrum)

A ruptured eardrum is a hole or tear in your eardr...

Ruptured spleen

A break in the surface of your spleen, usually fro...

Sacral dimple

Learn about the causes, complications and diagnosi...

Sacroiliitis

This joint inflammation can cause pain in the butt...

Salivary gland tumors

Learn about this rare tumor that forms in the sali...

Salmonella infection

This common bacterial infection is spread through ...

Sarcoidosis

This inflammatory disease results in growth of tin...

Sarcoma

Learn about this cancer that forms in the bones an...

Scabies

Learn more about this contagious condition that ca...

Scarlet fever

Learn more about the symptoms, causes, complicatio...

Schizoaffective disorder

This mental health condition includes schizophreni...

Schizoid personality disorder

People with this mental health condition do not wa...

Schizophrenia

This mental condition can lead to hallucinations, ...

Schizotypal personality disorder

This condition includes odd or eccentric thinking ...

Schwannoma

Learn about the diagnosis and treatment of this us...

Schwannomatosis

This rare conditions causes slow-growing tumors on...

Sciatica

Pressure on the sciatic nerve can cause pain and o...

Scleroderma

This group of rare diseases involves the hardening...

Sclerosing mesenteritis

Sclerosing mesenteritis is a rare condition that m...

Scoliosis

This sideways curvature of the spine occurs most o...

Scorpion sting

Scorpion stings are painful but rarely life-threat...

Scrotal masses

Lumps in the scrotum have various causes. Even pai...

Seasonal affective disorder (SAD)

This type of depression is related to changes in s...

Sebaceous carcinoma

Learn about diagnosis and treatments for this rare...

Seborrheic dermatitis

Find out what you can do to treat this flaky skin ...

Seborrheic keratosis

Learn more about the symptoms and treatments of th...

Secondary hypertension

Learn more about high blood pressure that's caused...

Seizures

Learn about this burst of electrical activity in t...

Selective IgA deficiency

A lack of the disease-fighting antibody called imm...

Self-injury/cutting

Deliberately hurting your own body, such as by cut...

Separation anxiety disorder

This is intense or prolonged separation anxiety th...

Sepsis

Learn more about the symptoms and treatment of sep...

Septic arthritis

Learn about this painful infection in a joint and ...

Serotonin syndrome

Learn how certain drug interactions or an increase...

Severe acute respiratory syndrome (SARS)

Learn about this contagious and sometimes fatal re...

Sex headaches

Learn about the causes and treatment of this type ...

Sexually transmitted diseases (STDs)

Find out the symptoms of STDs and what you can do ...

Shaken baby syndrome

Understand why shaking a baby can cause brain dama...

Shellfish allergy

It's possible to be allergic to some types of shel...

Shigella infection

This infection of the intestine causes diarrhea. L...

Shin splints

Shin splints are common in runners, dancers and mi...

Shingles

Learn more about symptoms, causes, treatment and v...

Short bowel syndrome

This digestive condition happens when part of the ...

Sick sinus syndrome

This heart rhythm disorder causes slow, paused or ...

Sickle cell anemia

Learn about the symptoms, causes and treatment of ...

Sinus headaches

Sinus headaches are often to blame for headache wi...

Sjogren's syndrome

If you're bothered by dry eyes and mouth, talk to ...

Skin cancer

Learn about skin cancer, including basal cell carc...

Sleep apnea

Snoring loudly could be an indication of sleep apn...

Sleep disorders

Common types include insomnia, sleep apnea, restle...

Sleep terrors (night terrors)

These are times of screaming or crying, intense fe...

Sleepwalking

People who get up and walk around while sleeping m...

Small bowel cancer

This type of cancer starts in the small intestine....

Small bowel prolapse (enterocele)

Learn more about this condition also called a vagi...

Small intestinal bacterial overgrowth (SIBO)

Small intestinal bacterial overgrowth (SIBO) can o...

Small vessel disease

Also called coronary microvascular disease, this t...

Smallpox

Learn about the symptoms, causes and vaccine preve...

Snoring

Is the sound of snoring disrupting sleep in your h...

Social anxiety disorder (social phobia)

Learn more on this disorder where everyday interac...

Soft palate cancer

Learn about the symptoms of this type of cancer th...

Soft tissue sarcoma

This rare type of cancer can begin in the muscles,...

Solitary fibrous tumor

This rare type of tumor most often occurs near the...

Solitary rectal ulcer syndrome

Solitary rectal ulcer syndrome is a rare condition...

Somatic symptom disorder

Learn about symptoms, causes and treatment for thi...

Sore throat

Find out what causes this common affliction, when ...

Specific phobias

These are extreme fears of objects or situations t...

Spermatocele

Learn more about this noncancerous testicular diso...

Spider bites

Learn more about prevention, symptoms, complicatio...

Spina bifida

Learn about this condition in which an unborn baby...

Spinal arteriovenous malformation (AVM)

Learn about how this rare blood vessel condition c...

Spinal cord injury

Learn what may happen after the spinal cord has be...

Spinal cord tumor

Spinal cord tumors can cause serious problems such...

Spinal headaches

These headaches can happen after a spinal tap proc...

Spinal stenosis

This condition narrows the amount of space within ...

Spontaneous coronary artery dissection (SCAD)

A torn blood vessel in the heart can cause a heart...

Sprained ankle

Sprained ankle — Injury to a ligament of the ank...

Sprains

A sprain is a stretching or tearing of ligaments �...

Squamous cell carcinoma of the skin

This common skin cancer usually looks like a bump ...

Stage 4 prostate cancer

Find out about diagnosis and treatment of this can...

Staph infections

Learn about the symptoms, causes and treatment of ...

Stevens-Johnson syndrome

Learn more about the causes of this rare disorder ...

Stomach cancer

Stomach cancer, which is also called gastric cance...

Stomach polyps

These masses of cells that form on your stomach li...

Strep throat

Learn more about the symptoms, causes and treatmen...

Stress fractures

Stress fractures are tiny cracks in bones often ca...

Stress incontinence

Movement such as coughing, laughing and running ca...

Stretch marks

Find out the symptoms of and treatment for this pa...

Stroke

Promptly spotting stroke symptoms leads to faster ...

Stuttering

Stuttering, sometimes called stammering, is a spee...

Stye (sty)

A stye (sty) is a painful red bump along the eyela...

Subarachnoid hemorrhage

Learn about how this type of bleeding in the brain...

Subconjunctival hemorrhage (broken blood vessel in eye)

Subconjunctival hemorrhage is a broken blood vesse...

Sudden cardiac arrest

This medical emergency involves sudden loss of all...

Sudden infant death syndrome (SIDS)

Learn about the unexplained death of a young baby ...

Suicide and suicidal thoughts

Suicide can be prevented. Learn suicide warning si...