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An anal fissure is a narrow tear that extends from the muscles that control the anus (anal sphincter) up into the anal canal

Antibiotics are medicines used to kill bacteria that cause infections. A doctor will choose an antibiotic to treat an illness

Appendicitis is one of the causes of serious belly pain. It happens when the appendix becomes infected and inflamed. The appendix

Antioxidants protect the body from damage caused by harmful molecules called oxygen free radicals. Some antioxidants are vitamins

An aortic aneurysm (say "a-OR-tik AN-yuh-rih-zum") is a bulge in part of the aorta, your main artery. If the bulge gets large

Aplastic anemia is a rare condition in which the bone marrow is unable to produce blood cells normally. The production of just

The aortic valve separates the lower left chamber (left ventricle) of the heart and the aorta, the large artery that carries blood

Anxiety disorders are a type of mental illness. Someone who has an anxiety disorder has severe anxiety that interferes with his or

Antibodies are proteins made by the body's natural defense system (immune system) to fight foreign substances, such as bacteria

Blood thinners are medicines that prevent blood clots. They do not actually thin the blood but increase the time it takes to form