Etiology = autoimmune disease and a type III hypersensitivity reaction; antigen-antibody complexes that are not adequately cleared by the immune cells causing inflammation; sunlight, stress, hormones, cigarettes, certain meds, and viruses; painful and swollen joints, muscle pain, unexplained fever, red rashes, chest pain on deep breathing, loss of hair, Raynaud phenomenon, sunlight sensitivity, swelling in legs and around eyes, mouth ulcers, swollen glands, and extreme fatigue