Primum non nocere… The fact that a surgical procedure can leave any kind of pain casts a shadow over this tenet, which is seen as the basis of medical practice and anchor of its principle ethic…It is all the more surprising in that medicine has only paid attention to this paradoxical chronic pain situation for the past few years. Clarifying the knowledge acquired in this field has become all the more urgent for any care-giver today confronted by a legitimate request from pati