 The classification system currently in use by the International Association for the Study of Pain (IASP) divides CRPS into two types.It is recognised that people may exhibit both types of CRPS.Clinical features of CRPS have been found to be inflammation resulting from the release of certain proinflammatory chemical signals from the nerves, sensitized nerve receptors that send pain signals to the brain, dysfunction of the local blood vessels' ability to constrict and dilate appropriately, and maladaptive neuroplasticity.