Rheumatism:

Rheumatism, any of several disorders that have in common inflammation of the connective tissues, especially the muscles, joints, and associated structures. The most common symptoms are pain and stiffness. Some people use the term ‘rheumatism’ to describe aches and pains. It may refer to osteoarthritis or rheumatoid arthritis. Learn more here. The term rheumatism stems from the Late Latin rheumatismus, ultimately from Greek ῥευματίζομαι "to suffer from a flux", with rheum meaning bodily fluids, i.e., any discharge of blood or bodily fluid. There are several diseases that are classified under rheumatic disorders. The term rheumatism is a loosely used layperson term to describe rheumatoid arthritis.