The etiology of rheumatoid arthritis is not very clear, most of the current that is the body's autoimmune diseases, can also be regarded as a chronic syndrome, the performance of peripheral joints of non-specific inflammation. At this time the diseased joint and its surrounding tissue showed progressive damage, and cause damage to the joint dysfunction. The incidence of rheumatoid arthritis women higher than men, female are 2 to 3 times the male; Europe and the United States the incidence was significantly higher than China.
