Rheumatology is a medical specialty that deals with the diagnosis and treatment of over 200 different rheumatic diseases. Rheumatic diseases affect bones, muscles, joints as well as internal organs such as brain, kidneys, lungs and blood vessels at times. These complex rheumatic diseases can be managed only by experts in rheumatology called rheumatologists. Some of the diseases treated by rheumatologists include osteoporosis and certain autoimmune diseases such as lupus, arthritis, musculoskeletal pain, and gout.