pain which causes significant distress or impairment in social, occupational, or other areas of functioning in which psychological factors are judged to play a significant role in the onset severity, exacerbation, or maintenance of pain.
Pain disorder is when a patient experiences chronic and constant pain in one or more areas, and is thought to be caused by psychological stress. The pain is often so severe that it disables the patient from proper functioning. It can last as short as a few days, to as long as many years.