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There are approximately 80 different types of autoimmune diseases and they affect more than 23 million Americans. Learn more about the causes, increasing prevalence and research advances regarding these diseases.

Multiple sclerosis (MS) is an autoimmune disease in which the body's immune system mistakenly attacks myelin, the fatty substance that surrounds and protects the nerve fibers in the central nervous system.

Systemic lupus erythematosus (lupus) is a chronic, systemic autoimmune disease which can damage any part of the body, including the heart, joints, skin, lungs, blood vessels, liver, kidneys and nervous system.

Allergies and asthma are immune mediated diseases that occur when the body's immune system overreacts to a foreign substance (an allergen), such as pollen or animal dander, that in most people is generally harmless.

Relapsing polychondritis (RP) is a rheumatic autoimmune disease. It is a rare disease in which the immune system attacks the body's cartilage.

There are many diseases and disorders that can cause the liver to stop functioning properly. Some of the different causes of liver disease include viral infection, alcohol or other environmental toxins, autoimmune disease and genetics.

Cancer represents more than 200 different types of malignancies—diseases caused by the uncontrolled and destructive growth of cells. When cancer cells grow unregulated, they can develop into tumors, invade nearby parts of the body and spread throughout the body.