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ACL injury
Learn about this injury that affects one of the main ligaments in your knee and most commonly occurs during sports such as soccer and football.
ARDS
With this condition, which can occur after a major illness or injury, fluid builds up in the lungs' air sacs so that less oxygen reaches the blood.
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.
Acanthosis nigricans
Learn about the causes of and treatment for this condition that causes dark, velvety patches in folds of the skin.
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.
Achilles tendinitis
Achilles tendinitis — Comprehensive overview covers symptoms, causes, treatment of this overuse injury.
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.
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.
Acoustic neuroma
This noncancerous tumor can sometimes grow on the nerve in the head that affects hearing and balance.
Acromegaly
An excess of growth hormone causes the bones to keep growing, which can lead to a number of serious complications if left untreated.
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