Pain disorder is one of the somatoform disorders.
The main clinical feature of this disorder is pain in at least one anatomical site, which cannot be fully attributed to a known medical disorder. Psychological factors are judged to play an important role in the onset, severity, exacerbation, or maintenance of the pain. The pain is not produced intentionally and is not under the patient's voluntary control. A somatoform disorder can not be better accounted for by a mood, anxiety, or psychotic disorder. Pain has a neurophysiological sensory component, which signals that tissue insult is occurring, and a perceptual, psychological component, which affects the subjective experience of pain.