Randomized Controlled Study of the Efficacy of Hypnosis Versus Relaxation and Control in Neuropathic Pain

Inclusion Criteria: * peripheral or central neuropathic pain, probable or definite * Diagnostic questionnaire score DN4 ≥ 4/10 * Chronic Pain with an average of pain intensity greater than or equal to 4/10 (digital scale) * Presence of daily or almost daily pain (i.e. at least 4 days per week) * Patient with pre-existing pain for \> 6 months * Patient \> 18 and \< 60 years old * Patient with a stable analgesic treatment since 15 days before inclusion * Patient able to participate to the trial during 33 weeks * Patient having a health insurance * Written informed consent signed by the patient. Exclusion Criteria: * Prior treatment with hypnosis * Currently under active psychotherapy (Cognitive-Behavior Therapy, psychoanalysis) * Work accident or litigation * Drugs abuse or Psychoactive Substance Abuse (DSM-IV) * Neuropathic pain associated with progressive disease (MS, HIV, cancer ...) * Major depression with ongoing disability or psychosis (DSM IV) * Intermittent pain * Patient with pre-existing pain for \< 6 months * Other more severe pain than the pain justifying inclusion * Subject unable to understand the trial information provided in the informed consent document * Subject under curators or guardianship * Severe Handicap or amputation * Participation to another study in the same period * Deafness * Cognitive disorders (dementia, Mild Cognitive Impairment, inability to understand the questionnaires) * For patients of the control arm: Treatment by hypnosis and / or relaxation, transcranial magnetic stimulation, or invasive treatments (surgery)