What is rheumatoid arthritis? Rheumatoid arthritis is an autoimmune disease that results in joint pain as well as damage throughout the body. The joint damage caused by RA usually affects both sides of the body. As a result, if a joint in one of your arms or legs are affected, the exact same joint in the other arm or leg is likely to be affected as well. This is one way doctors differentiate RA from other types of arthritis, such as osteoarthritis (OA).
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