Teen health
Learning Center
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Asthma: Limit asthma attacks caused by colds or flu
If you have asthma, find out how to keep your sneeze from turning into a wheeze due to colds or flu.
Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
Are you thinking about suicide? How to stay safe and find treatment
If you have suicidal thoughts, contact a suicide hotline or a mental health professional. Get help for depression. Make a plan to get through a crisis.
Aortic valve disease
Learn more about diseases that affect the valve between the heart's main pumping chamber and the body's main artery.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
Ambiguous genitalia
Learn about causes and treatment of ambiguous genitalia, a rare disorder of sex development in which a baby's external genitals are not clearly male or female.
Alzheimer's prevention: Does it exist?
Alzheimer's prevention: Strategies for staying physically and mentally fit may be most effective.
Allergy-proof your home
Here's a room-by-room guide to reducing allergy-triggering dust, mold, pollen and pet dander in your home.
Alcohol use: Weighing risks and benefits
Drinking alcohol in any amount is a health risk that increases with each drink you have. The risk peaks with heavy drinking, including binge drinking, which carries serious health risks.
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