Staying healthy
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Arteriovenous malformation
In this condition, a tangle of blood vessels affects the flow of blood and oxygen. Treatment can help.
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 calcification: An early sign of heart valve problems?
Aortic valve calcification — once thought a harmless condition — may be a sign of heart valve disease.
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 and dementia: What's the difference?
The terms 'Alzheimer's disease' and 'dementia' are often used to mean the same thing — but here's the real difference between them.
Allergies and asthma: They often occur together
Allergies and asthma? Find out how to control both conditions.
Albinism
In this group of inherited disorders, the body makes little or no melanin, a pigment that determines hair, skin and eye color and vision development.
Air travel with infant: Is it safe?
Planning for air travel with an infant? Know how air travel can affect a newborn's ears and breathing, and what you can do to keep your baby comfortable.
Adult bed-wetting: A concern?
Adult bed-wetting is uncommon and requires evaluation by a doctor. Learn about possible causes.
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