People with systemic lupus erythematosus (lupus) have antibodies that react against their tissues and organs. They may have a variety of findings and symptoms, including skin rashes that are worsened by sunlight, swollen and painful joints, ulcers in the nose or mouth, fatigue, fever, and inflammation of the lining around the lungs (pleuritis) or heart (pericarditis). Typically, symptoms flare up intermittently for a few weeks and then become less severe, sometimes for months or years.