Chiropractors approach patient care in a manner similar to that used in conventional medicine. They interview the patient, obtain a detailed health history, perform an examination, do tests, and develop a working diagnosis. They then develop a management plan, start treatment, and monitor the patients progress. Chiropractors often treat problems related to the musculoskeletal system. The manual treatment methods used by chiropractors range from stretching and sustained pressure to specific joint manipulations, which are usually delivered by hand and involve a quick and gentle thrust. The purpose of the manipulations is to improve joint motion and function. Manipulations are most commonly done on the spine, but other parts of the body may also be treated in this way.