Nutrition basics
Learning Center
Allergy-proof your home
Here's a room-by-room guide to reducing allergy-triggering dust, mold, pollen and pet dander in your home.
Alzheimer's prevention: Does it exist?
Alzheimer's prevention: Strategies for staying physically and mentally fit may be most effective.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
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.
Aortic valve stenosis
Learn more about the symptoms and treatment of this condition that reduces or blocks blood flow from the heart to the body.
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.
Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
Artificial sweeteners and other sugar substitutes
Get the facts on products that make food and drinks sweeter.
Ascariasis
Learn more about the causes, treatment and prevention of this roundworm infection.
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