Rheumatoid Arthritis Symptoms, Causes, Diagnosis and Treatment
Rheumatoid arthritis (RA) is a chronic (ongoing) autoimmune disease that causes pain, swelling and stiffness in the lining of your joints (synovium). It most commonly affects the joints in your fingers, hands, wrists, knees, ankles, feet and toes. RA usually occurs in the same joints on both sides of your body, which makes it different from some other types of arthritis.