What is rheumatoid arthritis?
RA is a long-lasting disease that can affect joints in any part of the body, but most commonly involves the hands, wrists, and knees. With rheumatoid arthritis, the immune system mistakenly attacks the body's joints and causes the joint lining to swell. The inflammation then spreads to the surrounding tissues, and can eventually damage cartilage and bone. In more severe cases, RA can affect other areas of the body, such as the skin, eyes, and nerves.
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