Posttraumatic stress disorder (PTSD) is a psychiatric disorder that can be developed after a person was exposed to life treating experience or experience that is continuing to happen. There are different kinds of trauma or stresses. There are some that are cause by natural disaster, some by warfare trauma, violence on civilians, sexual assault, physical assault, psychological assault and others. PTSD was first described on soldiers who participated in the American civil war. Mental problems in soldiers which took part in the First World War, experts of that era considered functional and labeled the term "grenade shock". Upon completion of the Second World War, the observed psychological disturbances of war participants were termed "uncommon" acute PTSDs occur within 3 months of the traumatic event, and chronic PTSD occurs after 3 or more months and in the postponed PTSD the symptoms occur 6 months after the traumatic event. Treatment of PTSD involves biological, social and psychological therapy. One that stands the most in these types of psychological disorder is psychological one. There are different approaches for it, it can be run as an individual conversation with a psychiatrist or in a way of group therapies that indicates larger progress in behavior of people in everyday life. There are different kinds of diagnosis analysis that can be done for this type of disorders. International classification MKB-10 is primarily used for classification of sickens and cause of deaths, while DSM-V is used for diagnosis of mental disorder behavior, and it is used on global scale. Advantage of specific group therapy primarily depends on the fact that individual has a chance to verbalize feelings without the fear of being judge, without the fear of non-acceptance. With that kind of activity, the progress of the emotional state of the person in hand, comes progress. With an individual progress there is a possibility that all members of the group learn about there own patterns of that behavior, and that they can see there reactions which are going to be positive or negative. Group psychotherapy is a method that uses group members to give feedback to the individual about his behavior and his emotional state. The advantage and specificity of this type of therapy is most in the sense that an individual has the opportunity to verbalize his feelings without fear of condemnation, prejudice and disapproval. The role of a nurse on people who are suffering from post-traumatic stress disorder is very broad in scope. Starting from communication skills to more complex beginnings of sister care for such patients. There is a great deal of empathy, knowledge and patience for such work. The nurses have first contact with the patient and are carrying it 24 hours a day. The nurse takes data for the sister's history by talking to family members and the patient himself. A nurse is a member of a therapeutic team and has to know the psychic disorder and recognize the patient's needs that the health care aspect can accomplish.