Aerobic exercise
Learning Center
Acute kidney injury
Learn what happens when the kidneys suddenly stop working, what causes this condition and how it's treated.
Acute coronary syndrome
Know the symptoms, causes and treatment of this heart condition. The term refers to many conditions that cause sudden, low blood flow to the heart.
Acromegaly
An excess of growth hormone causes the bones to keep growing, which can lead to a number of serious complications if left untreated.
Acoustic neuroma
This noncancerous tumor can sometimes grow on the nerve in the head that affects hearing and balance.
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.
Achilles tendon rupture
An Achilles tendon rupture is an injury that is usually painful and likely to affect your ability to walk. Surgical repair is sometimes necessary.
Achilles tendinitis
Achilles tendinitis — Comprehensive overview covers symptoms, causes, treatment of this overuse injury.
Achalasia
In this condition, the muscles in the esophagus don't relax, preventing food and drink from moving into the stomach. Learn more about this rare digestive disorder.
Acanthosis nigricans
Learn about the causes of and treatment for this condition that causes dark, velvety patches in folds of the skin.
Abdominal aortic aneurysm
An aneurysm in the lower part of the aorta can grow slowly and silently. Know the symptoms of this dangerous condition and the treatment.
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