Fertility
Learning Center
Abnormal sperm morphology: What does it mean?
Abnormal sperm morphology may be a contributing factor in male infertility.
Absence seizure
This type of seizure produces symptoms such as a vacant stare, lip smacking and eyelid fluttering.
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.
Active surveillance for prostate cancer
Learn about why doctors may recommend active surveillance for prostate cancer and what to expect.
Acute flaccid myelitis (AFM)
Know the possible symptoms of acute flaccid myelitis (AFM), a rare but serious condition that affects young children.
Adrenal fatigue: What causes it?
Adrenal fatigue is a term used to describe a group of symptoms that aren't specific. It's not an official medical diagnosis.
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.
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.
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