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Arthritis means joint inflammation.. It causes pain and swelling in the body's joints, such as the knees or hips. There are many types of arthritis, but osteoarthritis is the most common.
In this article. Font Size. A. A. A. Rheumatoid arthritis (RA) can affect your knees and any other joint in your body. Itâs an immune system disorder in which the body attacks itself, and especially the joints. Doctors donât know exactly what causes it.n this article. Font Size. A. A. A. Rheumatoid arthritis (RA) can affect your knees and any other joint in your body. Itâs an immune system disorder in which the body attacks itself, and especially the joints. Doctors donât know exactly what causes it.