Rheumatoid arthritis (RA) is a painful inflammatory disease that causes swelling, stiffness, joint destruction, and deformity. This autoimmune disease has an effect on the cells that coat and lubricate joints (synovial tissue).
Osteoarthritis (the "wear and tear" arthritis") may often affect just one joint even though it can affect multiple joints. Rheumatoid arthritis, though, typically affects multiple joints and usually happens symmetrically. For instance, RA may affect the same joint group on both sides of the body.
Pain and stiffness that last for more than an hour upon arising
What causes RA?
Scientists are unsure about the causes of RA. They do know that RA affects about 1.3 million Americans and occurs in all racial and ethnic groups. About two to three times as many women suffer from rheumatoid arthritis as men. Some rheumatoid arthritis research points to the following factors as possibly influencing rheumatoid arthritis: