TABLE 1.

Definitions of pain terms

Pain	An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage
Allodynia	Pain due to a stimulus which does not normally provoke pain
Dysesthesia	An unpleasant abnormal sensation, whether spontaneous or evoked
Hyperalgesia	An increased response to a stimulus which is normally painful
Anesthesia dolorosa	Pain in an area or region that is anesthetic
Nociceptor	A receptor preferentially sensitive to a noxious stimulus or to a stimulus that would become noxious if prolonged
Neuropathic pain	Pain initiated or caused by a primary lesion or dysfunction in the nervous system

Data from reference 281