Kids and Teens

Acne is a common skin condition that develops when the hair follicles in your skin are blocked by dead skin…

Learn about the symptoms, causes, treatment and prevention of acute bronchitis, a lung infection usually caused by a virus.

Alcohol abuse is a pattern of drinking too much alcohol too often. This can harm your work, school, and…

Allergic rhinitis is a reaction to allergens such as pollen. It causes nasal symptoms that can usually be treated with…

Alopecia areata is an autoimmune disease that causes you to lose small, round patches of hair on your head.

Amblyopia (lazy eye) develops in childhood when one eye doesn’t work properly with the brain. Left untreated, it can lead…

Amenorrhea is the absence of menstruation or a monthly period. Learn about the various causes and treatments for primary and…

Anaphylaxis is a life-threatening allergic reaction that requires immediate medical attention.

Anemia is a common blood disorder that affects your red blood cells. Learn about the types, causes, treatments, and prevention…

What is appendicitis? An appendicitis is inflammation or infection in your appendix. The appendix is a tube-like organ in your abdomen. It is attached to the first portion of your large intestine. It has no known purpose. If the infection is not treated

An arrhythmia is a change in the rhythm of your heartbeat. Your heart may beat too fast, too slow, or…

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a genetic condition that causes abnormal heart rhythms. It is more common in people…

Asperger’s syndrome is a developmental disorder on the autism spectrum that can be diagnosed in children as young as 18…

Asthma is a chronic disease of the lungs. It often starts in childhood and can be treated and managed with…