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Lupus, technically known as systemic lupus erythematosus (SLE), is an autoimmune disease in which the body's immune system mistakenly attacks healthy tissue in many parts of the body. Symptoms vary among people and may be mild to severe. Common symptoms include painful and swollen joints, fever, chest pain, hair loss, mouth ulcers, swollen lymph nodes, feeling tired, and a red rash which is most commonly on the face. Often there are periods of illness, called flares, and periods of remission during which there are few symptoms. The cause of SLE is not clear. It is thought to involve a combination of genetics and environmental factors. Among identical twins, if one is affected there is a 24% chance the other one will also develop the disease. Female sex hormones, sunlight, smoking, vitamin D deficiency, and certain infections are also believed to increase a person's risk. The mechanism involves an immune response by autoantibodies against a person's own tissues. These are most commonly anti-nuclear antibodies and they result in inflammation. Diagnosis can be difficult and is based on a combination of symptoms and laboratory tests. There are a number of other kinds of lupus erythematosus including discoid lupus erythematosus, neonatal lupus, and subacute cutaneous lupus erythematosus. There is no cure for SLE, but there are experimental and symptomatic treatments. Treatments may include NSAIDs, corticosteroids, immunosuppressants, hydroxychloroquine, and methotrexate. Although corticosteroids are rapidly effective, long-term use results in side effects. Alternative medicine has not been shown to affect the disease. Life expectancy is lower among people with SLE, but with modern treatment, 80–90% of patients can survive for 10 years or more, although men have higher mortality. SLE significantly increases the risk of cardiovascular disease with this being the most common cause of death. While women with lupus have higher risk pregnancies, most are successful. Rate of SLE varies between countries from 20 to 70 per 100,000.

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