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Animal dander is loose skin cells (like dandruff) from animals such as dogs and cats. These skin cells, which contain secretions

Angioplasty is a procedure done to open a narrowed or blocked blood vessel so that blood can flow through it more easily. During

Angina happens when there is not enough blood flow to the heart muscle. This low blood flow is often a result of coronary artery

Anencephaly is a condition in which a fetus forms with a partially formed brain and spinal cord. A child with this condition will

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