With the development and introduction of new classification systems, there has been a revision of psychiatric disorders related to stress. Development on every level has led to a change in society and thus to the concept of stress and the diseases that develop in connection with it. There are differences in the American and European classification systems. Acute stress reaction has been removed from the European classification system. Post-Traumatic Stress Disorder (PTSD) has undergone the greatest changes. A diagnosis of PTSD requires evidence of trauma exposure, and is characterized by symptoms of trauma reexperiencing, avoidance, and changes in arousal and reactivity. The American classification system added another symptom cluster related to trauma- related changes in cognition and mood, while the European classification system added complex PTSD as a new diagnosis. Complex Post- Traumatic Stress Disorder (CPTSD) was introduced as a new diagnostic category in ICD-11. It en compasses PTSD symptoms along with Disturbances in Self-Organization (DSO), ie, affect dysregulation, negative self-concept, and disturbances in relationships. Also, the diagnosis of prolonged grief disorder was introduced, with clear diagnostic criteria. An integrative and multidisciplinary approach, with appropriate diagnostics and treatment are necessary in the era of new traumas and its complex consequences to mental health.

Bojana Pejuskovic is specialist of psychiatry, subspecialist of clinical pharmacology, she is a Head of Clinical Department for Stress, Crisis and Affective Disorders at Institute of Mental Health, Belgrade, Serbia. She is Associate professor at School of Medicine, University of Belgrade. She is also psychotherapist. She has finished Masters in Psychotherapy defend Master Thesis: “Burn-out syndrome of medical doctors different specialty – role of personality dimensions and coping strategies”, School of Medicine, University of Belgrade. She has finished Doctoral dissertation, defend PhD Thesis: “Posttraumatic stress disorder – predictors of development and recovery”, School of Medicine, University of Belgrade. She has published a lot of papers, guidelines and book chapters that have been cited over 400 times, and her publication h-index is 10. She has been involved in a several research projects and has developed cooperation with important institutions, including International Trauma Consortium.