A psychiatrist is a doctor who diagnoses and treats both acute pain and chronic pain and specializes in a wide variety of nonsurgical treatments for the musculoskeletal system. They perform specialized nerve tests and spine imaging to assess the location and severity of nerve damage. Physiatrists commonly treat patients with any kind of back pain or neck pain, work or sports-related injuries, fibromyalgia, myofascial pain, arthritis, tendonitis, and spinal cord injuries. They treat patients of all ages. They treat patients using some procedures such as EMG, phototherapy, nerve and muscle biopsy, injections of joints, disability assessment, etc.