arthritis

arthritis Inflammation of a joint. When joints are inflamed, they can develop stiffness, warmth, swelling, redness, and pain. There are more than 100 types of arthritis. See also ankylosing spondylitis; arthritis, degenerative; arthritis, gouty; arthritis, Lyme; psoriatic arthritis; arthritis, Reiter; arthritis, rheumatoid; arthritis, spondylitis; gout; lupus; pseudogout.