By eHow Health Editor
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Rheumatoid arthritis is an autoimmune disorder that affects the linings of the joints. This means that the immune system has mistakenly recognized the joint linings as foreign invaders. As a result, the immune system attacks the joint linings and causes pain, inflammation and swelling in the joints. These conditions will ultimately lead to damage and deformity in the affected joints if left untreated.
eHow Health Editor