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. It isn’t cancer, and it isn’t related to AIDS.
Lupus is a disease that can affect many parts of the body. Everyone reacts differently. 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, the brain, and/or the eyes. If you have lupus, it may affect two or three parts of your body. Usually, one person doesn’t have all the possible symptoms.