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Rheumatoid arthritis (RA) is an inflammatory disease that causes pain, swelling, stiffness, and loss of function in the joints. It occurs when the immune system, which normally defends the body from invading organisms, turns its attack against the membrane lining the joints.

Click here for more information.  http://www.niams.nih.gov/Health_Info/Rheumatic_Disease/default.asp

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