Nutrition basics
Learning Center
Alkaline water: Better than plain water?
Health claims about alkaline water abound, but plain water is usually best.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
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.
Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
Arthritis pain: Do's and don'ts
Arthritis pain — To cope, strike a balance between activity and rest.
Artificial sweeteners and other sugar substitutes
Get the facts on products that make food and drinks sweeter.
Artificial tears: How to select eye drops for dry eyes
Not all eye drops are the same. Here's what to consider when choosing artificial tears for dry eyes.
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