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Rheumatoid arthritis is a chronic (long-lasting) inflammatory disease that causes pain, stiffness, warmth, redness and swelling in joints. Over time, the affected joints may become misshapen, misaligned and damaged.
Rheumatoid arthritis (RA) happens when your bodyâs defenses -- your immune system -- targets your joint linings. Itâs a long-term condition that also affects other tissue, but the joints are usually the most severely affected. This is different from osteoarthritis, a condition caused by wear and tear on joints. Doctors donât know exactly what causes RA. It may be a combination of genes and environment.