Psychotherapy by means of hypnosis is one of the oldest methods of psychotherapy. The hypnotherapy method is particularly suitable for treating trauma victims. This article presents a clinical case and description of treatment by the hypnotherapy method called Ego State Hypno-Analysis. This treatment is part of a multi-stage therapeutic program based on the principles of the psycho-trauma treatment by Pierre Janet and John Watkins. The results indicate that hypnotic psychotherapy can accelerate and improve the treatment of patients suffering from chronic PTSD.