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…

Learn about the symptoms, causes, diagnosis, treatment and prevention of allergies and allergic rhinitis (hay fever).

Alopecia areata is a disease of your immune system that causes unpredictable hair loss and emotional challenges.

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…

Learn about the causes and treatment of anaphylaxis, a severe, life-threatening allergic reaction.

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

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…

Learn about the causes, treatment and prevention of asthma symptoms (also called asthma attacks).

Living with asthma as a child can be difficult. Asthma attacks interfere with a child’s physical activity, sleep, and can…

Attention-Deficit Hyperactivity Disorder (ADHD) is a group of behaviors that causes problems with focus and self control. It affects children…

Learn about causes of and treatments for autism.