Teen health
Learning Center
Absence seizure
This type of seizure produces symptoms such as a vacant stare, lip smacking and eyelid fluttering.
Acute flaccid myelitis (AFM)
Know the possible symptoms of acute flaccid myelitis (AFM), a rare but serious condition that affects young children.
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.
Airplane ear
That fullness in your ear when on an airplane that's climbing or descending results from uneven air pressure between your middle ear and the environment.
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.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
Alternative cancer treatments: 11 options to consider
Alternative cancer treatments may help you cope with cancer treatment side effects such as fatigue, pain, sleep problems, and nausea and vomiting.
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.
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