Pregnancy symptoms
Learning Center
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenoleukodystrophy — a hereditary disorder that affects the brain, nervous system and adrenal gland.
Adult bed-wetting: A concern?
Adult bed-wetting is uncommon and requires evaluation by a doctor. Learn about possible causes.
Air travel during pregnancy: Is it safe?
Consider these guidelines if you need to fly while you're pregnant.
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.
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Find out what treatments and prevention tips can help.
Allergies and asthma: They often occur together
Allergies and asthma? Find out how to control both conditions.
Allergy medications and pregnancy: What's safe?
Find out what medicines can help you manage allergies while you're pregnant.
Allergy skin tests
Considering skin testing for your allergies? Learn about the risks, results and what to expect during testing.
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.
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