Arthritis is the inflammation one or more joints.
More than 50 million Americans suffer from osteoarthritis, rheumatoid arthritis, and related conditions, such as fibromyalgia, gout, lupus, Lyme disease, psoriatic arthritis, Reiter's syndrome, Sj6gren's syndrome, and ankylosing spondylitis. These conditions affect the body's movable, or synovial, joints. Joints of the body are found at the knees, wrists, elbows, fingers, toes, hips, and shoulders. The neck and back also have joints between the bones of the spine. The fluid is secreted by a thin membrane, the synovial membrane, thalines the inside of the joint capsule.