Also often referred to simply as lupus, this is an autoimmune disorder that causes chronic inflammation in various parts of the body. Three main types of lupus are recognized—discoid, systemic, and drug-induced.

Discoid lupus affects only the skin and does not usually involve internal organs. In about 10 percent of people with discoid lupus, the disease will evolve into the more severe systemic form of the disorder.

Systemic lupus erythematosus is the most common form of the disease. It may affect virtually any organ or structure of the body, especially the skin, kidneys, joints, heart, gastrointestinal tract, brain, and serous membranes (membranous linings of organs, joints, and cavities of the body).