Definition of Rheumatoid ArthritisRheumatoid arthritis (RA) is an autoimmune disease that causes chronic inflammation of the joints. Rheumatoid arthritis can also cause inflammation of tissue around the joints, as well as on other organs in the body. Autoimmune diseases are illnesses that occur when the body tissues in vain (mistaken) is attacked by its own immune system. Immune system is a
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