Arthritis is a common health problem in which the joints are inflamed. There are many types of arthritis. In rheumatoid arthritis, the body’s own immune system attacks the joints. This causes pain, stiffness, and swelling in the joints, especially in the hands and feet. It can become hard to open jars, write, and do other daily tasks. Sometimes rheumatoid arthritis can also cause bumps to form under the skin.
Over time, rheumatoid arthritis can damage and deform joints. Early treatment with medicines may reduce your chances of having a lasting disability.