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Abdominal ultrasound
An ultrasound of the abdomen is the preferred test to screen for an aortic aneurysm. But it may be done for other health reasons, too. Learn why.
Abnormal sperm morphology: What does it mean?
Abnormal sperm morphology may be a contributing factor in male infertility.
Acanthosis nigricans
Learn about the causes of and treatment for this condition that causes dark, velvety patches in folds of the skin.
Acetyl-L-carnitine: Can it relieve MS fatigue?
Some research suggests that acetyl-L-carnitine may improve fatigue associated with multiple sclerosis, but more study is needed.
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.
Acid reflux and GERD: The same thing?
Acid reflux and GERD are closely related, but the terms aren't necessarily interchangeable.
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.
Acne scars: What's the best treatment?
Various procedures can improve acne scars, but no single treatment is best for everyone.
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