 The original diagnostic criteria for CRPS adopted by the International Association for the Study of Pain (IASP) in 1994 have now been superseded in both clinical practice and research by the ‘‘Budapest Criteria” which were created in 2003 and have been found to be more sensitive and specific.They have since been adopted by the IASP.The criteria require there to be pain as well as a history and clinical evidence of Sensory, Vasomotor, Sudomotor and Motor or Trophic changes.