Second trimester
Learning Center
Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Most allergies can't be cured, but treatments can help.
Alpha-gal syndrome
An allergic reaction to meat-based meals had researchers stumped — until they connected the condition to bites from certain ticks.
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.
Ameloblastoma
Learn more about the symptoms and treatment of this rare, noncancerous (benign) tumor that develops in the jaw.
Amenorrhea
Absence of menstruation (amenorrhea) may be linked to an underlying, treatable problem. Learn about amenorrhea causes and when to seek help.
Amnesia
Read about what can cause memory loss and learn steps you can take to manage it.
Ampullary cancer
Learn more about the causes, diagnosis and treatments for cancer of the ampulla of Vater.
Amyloidosis
This rare disease can affect different organs in different people. Find out how early and accurate diagnosis can lead to better outcomes.
Amyotrophic lateral sclerosis (ALS)
This progressive nervous system disease, also known as Lou Gehrig's disease, destroys nerve cells.
Anal cancer
Learn about this cancer that affects the anal canal and causes bleeding and pain. Treatment is usually with a combination of radiation and chemotherapy.
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