Rheumatoid Arthritis (RA): Causes, Symptoms, and Treatments - Arthritis means swelling in a joint. That inflammation causes inflammation, warmth, swelling, as well as pain within the joint. Rheumatoid Arthritis affects joints on both sides of the body, such as both hands, both wrists, or both knees. This symmetry assists to establish it in addition to other sorts of arthritis. Rheumatoid