A chiropractor, or doctor of chiropractic medicine, is a licensed medical professional who specializes in diagnosing and treating disorders of the musculoskeletal and nervous system, especially in the spine. Chiropractors believe that many health problems can stem from the misalignment, or subluxation, of the vertebrae. The main aspect of treatment in chiropractic care is usually physical manipulation of joints and spine to bring them back into alignment. Chiropractors may also recommend exercises or offer health and nutritional counselling. Chiropractors do not do surgery or prescribe medication. Chiropractic medicine is sometimes referred to as a form of alternative medicine, though many chiropractors (and patients) do not agree with this designation.