what lining of joint is affected by rheumatoid arthritis
Share +. Text A A A. Rheumatoid arthritis (RA) is an autoimmune disease where the body's immune system attacks normal joint tissues, causing inflammation of the joint lining. This inflammation of the joint lining (called the synovium) can cause pain, stiffness, swelling, warmth, and redness.A can affect many different joints. In some people, it can even affect parts of the body other than the joints, including the eyes, blood, the lungs, and the heart. Although RA is often a chronic disease, the severity and duration of symptoms may unpredictably come and go.