Approximately 40 million people in the United States have arthritis. It is an inflammatory disorder of the joints that may produce pain and swelling. . Joints are located wherever two or more bones meet. Cartilage and a lubricating fluid form a smooth gliding surface for the bones of the joint.
Ligaments hold the joint together.
When joints become injured or diseased, they swell. Over 100 types of arthritis affect the joints and connective tissues of the body. Inflammation is a normal part of the body's defense system. It is a natural reaction to injury. Inflammation causes swelling, pain, and redness.