Healthy retirement
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.
Acne
Learn more about this common skin condition, including causes, treatments and simple skin care steps you can do at home to help control it.
Active surveillance for prostate cancer
Learn about why doctors may recommend active surveillance for prostate cancer and what to expect.
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.
Aging: What to expect
Understand the natural changes that come with aging.
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.
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.
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