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Learning Center
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.
Aging: What to expect
Understand the natural changes that come with aging.
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenoleukodystrophy — a hereditary disorder that affects the brain, nervous system and adrenal gland.
Acute flaccid myelitis (AFM)
Know the possible symptoms of acute flaccid myelitis (AFM), a rare but serious condition that affects young children.
Active surveillance for prostate cancer
Learn about why doctors may recommend active surveillance for prostate cancer and what to expect.
Acetaminophen and children: Why dose matters
This medicine is an effective pain reliever, but an overdose can happen all too easily. Follow these tips to keep your child safe.
Absence seizure
This type of seizure produces symptoms such as a vacant stare, lip smacking and eyelid fluttering.
Abnormal sperm morphology: What does it mean?
Abnormal sperm morphology may be a contributing factor in male infertility.
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