Rheumatic diseases are characterised by inflammation and loss of function of one or more connecting or supporting structures of the body. These diseases especially affect joints, tendons, ligaments, bones, and muscles. Common signs and symptoms are pain, swelling, and stiffness. Some rheumatic diseases also can involve internal organs. There are more than 100 rheumatic diseases. Some are described as connective tissue diseases because they affect the supporting framework of the body and its internal organs. Others are known as autoimmune diseases because they occur when the immune system,...