A rheumatologist is a specialist in internal medicine of joints, muscles, and bones. Another specialist on our list, an orthopedist, also works with the joints, muscles, and bones, but a rheumatologist is unique because they focus on the origin of the problem, and the body's overall movement and health. Orthopedists tend to focus on more acute areas of pain and injury. We'll get into more about orthopedists later. One of the main reasons to see a rheumatologist is because of arthritis, but they also work with patients who have tendinitis, lupus, gout, and more, to manage chronic pain.