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Learning Center
Alcohol poisoning
This condition is due to drinking large amounts of alcohol in a short time. It is serious and can be deadly. Here's what to do in an emergency.
Alcohol intolerance
Having an immediate reaction after drinking alcohol, such as a stuffy nose and skin flushing, might indicate alcohol intolerance.
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.
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.
Agoraphobia
Agoraphobia is an anxiety disorder in which you fear and avoid public places or situations where you might feel panicked, trapped, helpless or embarrassed.
Age spots (liver spots)
Learn more about the harmless dark spots on your skin that tend to appear as you age, especially in areas exposed to the sun. Treatment is available.
Adult attention-deficit/hyperactivity disorder (ADHD)
This mental health disorder includes a combination of persistent problems, such as difficulty paying attention, hyperactivity and impulsive behavior.
Adult Still disease
Learn about symptoms, complications and treatment of this inflammatory disorder.
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenoleukodystrophy — a hereditary disorder that affects the brain, nervous system and adrenal gland.
Adrenal cancer
Learn about this rare cancer that begins in the adrenal glands. Find out about symptoms, diagnosis and treatment, including adrenalectomy.
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