A rheumatologist is a physician specialized in the field of medical sub-specialty called rheumatology. Rheumatologists treat arthritis, autoimmune diseases, pain disorders affecting joints, and osteoporosis. There are more than 200 types of these diseases, including rheumatoid arthritis, osteoarthritis, gout, lupus, back pain, osteoporosis, and tendinitis. Some of these are very serious diseases that can be difficult to diagnose and treat. They treat soft tissue problems related to musculoskeletal system sports related soft tissue disorders and the specialty is also interrelated with physiotherapy, physical medicine and rehabilitation of disabled patients. Patient education programs and occupational therapy also go hand in hand with this specialty.