The cause of rheumatoid arthritis is not known. Many factors are involved in the abnormal activity of the immune system that characterizes rheumatoid arthritis. These factors include genetics (heredity), hormones (explaining why the disease is more common in women than men), and possibly infection by a bacterium or virus.
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Joint Camp
Today, Baby Boomers go to "joint" camp to prepare for hip and knee replacement surgery. See more WebMD Videos »
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