It's easy to go out early, so the first time you're wearing a woman Another common form of arthritis RA is an autoimmune disease. It happens when your body's immune system attacks body tissue. These attacks affect the synovial tissue in the joints, a fluid that nourishes the cartilage and lubricates the joints. Gout - A type of arthritis caused by excessive uric acid in the body. This can stay in the joints (usually affecting the big toe), but can develop in any joint. It can cause severe pain, redness and swelling.