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Ampullary cancer
Learn more about the causes, diagnosis and treatments for cancer of the ampulla of Vater.
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.
Angina
Learn about a type of chest pain caused by reduced blood flow to the heart. This chest pain is a symptom of heart disease.
Anthrax
Learn about the symptoms and risks of anthrax, a rare but deadly bacterial disease that's been used in bioterrorism.
Antibiotic-associated diarrhea
Learn more about why you might get diarrhea while taking antibiotics, as well as how to treat or prevent this uncomfortable and sometimes serious problem.
Aphasia
Some conditions, including stroke or head injury, can seriously affect a person's ability to communicate. Learn about this communication disorder and its care.
Aplastic anemia
Your body stops producing enough new blood cells in this rare and serious condition, possibly causing fatigue, higher risk of infections and uncontrolled bleeding.
Appendicitis
Is it just a bellyache or something more serious? Find out about the symptoms and treatment for inflammation of the appendix.
Arteriovenous fistula
Irregular connections between arteries and veins may cause certain complications. Learn more about the causes and possible treatment options.
Asthma attack
Learn how to recognize when you need to use quick-relief treatment or get emergency care.
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