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Ampullary cancer
Learn more about the causes, diagnosis and treatments for cancer of the ampulla of Vater.
Amnesia
Read about what can cause memory loss and learn steps you can take to manage it.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Ameloblastoma
Learn more about the symptoms and treatment of this rare, noncancerous (benign) tumor that develops in the jaw.
Alzheimer's disease
Understand more about this brain disorder that's the most common cause of dementia. Also learn about new tests and medicines on the market.
Alpha-gal syndrome
An allergic reaction to meat-based meals had researchers stumped — until they connected the condition to bites from certain ticks.
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
Alcoholic hepatitis
Heavy drinking over years can damage the liver.
Alcohol use disorder
Unhealthy alcohol use ranges from mild to severe, including alcoholism and binge drinking, putting health and safety at risk. Early treatment is important.
Alcohol poisoning
This condition is due to drinking large amounts of alcohol in a short time. It is serious and can be deadly. Here's what to do in an emergency.
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