What Causes Arthritis?

There are more than 100 types of arthritis, including common diseases like osteoarthritis, rheumatoid arthritis, gout, lupus and scleroderma. No one knows exactly what causes arthritis. Some types are inherited, some are caused by problems with the immune system, and others can be caused or aggravated by physical trauma, overuse of a joint, or being overweight or physically inactive. You can find more information here: