Rheumatism is a term used to describe various painful conditions that affect joints, muscles and bones. It can be caused by many factors such as injury or overuse, infection, autoimmune diseases, or metabolic disorders. Symptoms of rheumatism include swelling, stiffness, and pain in the affected areas. The term is often used broadly to refer to any type of joint or muscle pain, but it can also be a specific diagnosis such as rheumatoid arthritis or gout.