Lupus is an autoimmun disease. The immune system’s job is to fight foreign substances in the body, like germs and viruses. But in autoimmune diseases, the immune system is out of control. It attacks healthy tissues, not germs.You can’t catch lupus from another person.

Lupus is a disease that can affect many parts of the body. One person with lupus may have swollen knees and fever. Another person may be tired all the time or have kidney trouble. Someone else may have rashes. Lupus can involve the joints, the skin, the kidneys, the lungs, the heart and/or the brain. If you have lupus, it may affect two or three parts of your body. Usually, one person doesn’t have all the possible symptoms. And it effects everyone differently.

There are three main types of lupus: Systemic lupus erythematosus is the most common form. It’s sometimes called SLE, or just lupus. The word "systemic" means that the disease can involve many parts of the body such as the heart, lungs, kidneys, and brain. SLE symptoms can be mild or serious. Discoid lupus erythematosus mainly affects the skin. A red rash may appear, or the skin on the face, scalp, or elsewhere may change color.

Lastly there is Drug-induced lupus is triggered by a few medicines. It’s like SLE, but symptoms are usually milder. Most of the time, the disease goes away when the medicine is stopped. More men develop drug-induced lupus because the drugs that cause it, hydralazine and procainamide, are used to treat heart conditions that are more common in men.

We don’t know what causes lupus. There is no cure, but in most cases lupus can be managed. Lupus sometimes seems to run in families, which suggests the disease may be hereditary. Having the genes isn’t the whole story, though. The environment, sunlight, stress, and certain medicines may trigger symptoms in some people. Other people who have similar genetic backgrounds may not get signs or symptoms of the disease. Researchers are trying to find out why.

Anyone can get lupus. But 9 out of 10 people who have it are women. African American women are three times more likely to get lupus than white women. It’s also more common in Hispanic/Latino, Asian, and American Indian women.

Both African Americans and Hispanics/Latinos tend to develop lupus at a younger age and have more symptoms at diagnosis (including kidney problems).

They also tend to have more severe disease than whites. For example, African American patients have more seizures and strokes, while Hispanic/Latino patients have more heart problems. We don’t understand why some people seem to have more problems with lupus than others.