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Onyx Fitness Article: Arthritis   Arthritis is inflammation of one or more joints, which results in pain, swelling, stiffness, and limited movement. There are over 100 different types of arthritis. See also: Joint pain Alternative Names Joint inflammation Causes, incidence, and risk factors Arthritis involves the breakdown of cartilage. Cartilage normally protects the joint, allowing for smooth movement. Cartilage also absorbs shock when pressure is placed on the joint, like when you walk. Without the usual amount of cartilage, the bones rub together, causing pain, swelling (inflammation), and stiffness. You may have joint inflammation for a variety of reasons, including: An autoimmune disease (the body attacks itself because the immune system believes a body part is foreign) Broken bone General "wear and tear" on joints Infection (usually caused by bacteria or viruses ) Often, the inflammation goes away after the injury has healed, the diseas