Anesthesia dolorosa Causalgia list of pain terms and definitions, which was first published in 1979. These terms arose as a result of agreement between various specialties, including anesthesiology, neurology, neuro-surgery, psychiatry and psychology. The following list may prove useful in the further reading of this chapter [1].

Allodynia is pain due to a stimulus that does not usually provoke pain. Allodynia involves a change in the quality of sensation such that a sensation that is normally non-painful becomes so. The stimulus may be mechanical, e.g. light touch, or thermal. is the absence of pain in response to stimulation that would normally be painful. is pain in an area or region that is anesthetic.

is a syndrome of sustained burning pain, allodynia and hyperpathia after a traumatic nerve lesion, often combined with vasomotor and sudomotor dysfunction and later trophic changes.

Central pain is pain associated with a lesion of the CNS.

Dysesthesia is an unpleasant abnormal sensation, whether spontaneous or evoked. This definition encompasses allodynia and hyper-pathia.

Hyperpathia is pain characterized by increased reaction to a stimulus, especially a repetitive one. Hyper/ is an increased/decreased res-

hypoalgesia ponse to a stimulus that is normally painful. Neuralgia is pain in the distribution of a nerve or nerves. Neuropathy is a disturbance of function or pathological change in a nerve; in one nerve, mononeuropathy; in several nerves, mononeuropathy multiplex; if diffuse and bilateral, polyneuropathy. Nociceptor is a receptor preferentially sensitive to a noxious stimulus or to a stimulus that would become noxious if prolonged.

Paresthesia is an abnormal sensation, whether spontaneous or evoked. This is different from dysesthe-sia, as it describes an abnormal sensation that is not unpleasant.

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