Healthy pregnancy
Learning Center
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Anaphylaxis
Anaphylaxis, a severe allergic reaction, is an emergency. Learn who's at risk, what to watch for and what to do when it occurs.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
Ankle swelling during pregnancy: What helps?
Try these tips to prevent and treat swelling of the ankles during pregnancy.
Anorexia nervosa
Anorexia is an eating disorder characterized by an abnormally low body weight, intense fear of gaining weight and a distorted perception of body weight.
Antibiotics and pregnancy: What's safe?
Learn about common types of antibiotics used during pregnancy and their safety.
Antidepressants for children and teens
Antidepressants are often effective in treating depression and anxiety in children and teenagers, but there are some risks. Learn more.
Anxiety disorders
Learn the symptoms of this mental health condition, and ways to manage worry and fear that interfere with your daily activities.
Aortic valve disease
Learn more about diseases that affect the valve between the heart's main pumping chamber and the body's main artery.
Aortic valve repair and aortic valve replacement
These types of heart valve surgeries are done to treat aortic valve disease, including aortic stenosis and aortic regurgitation.
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