Skin care
Learning Center
Alzheimer's: Managing sleep problems
Alzheimer's sleep problems affect both you and your loved one. Consider tips for coping.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Amputation and diabetes: How to protect your feet
Find out who's at risk and what you can do to protect your feet from diabetes complications.
Anal fissure
Learn what causes a tear in the anus and how to prevent or treat this often painful condition.
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.
Anorexia nervosa
People with this eating disorder have a very low body weight, an intense fear of gaining weight and a flawed way of seeing their body.
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.
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