PTSD is a psychiatric disorder that can occur in people who have experienced or witnessed a traumatic event such as a natural disaster, a serious accident, a terrorist act, war/combat, rape, or other violent personal assault. Symptoms of PTSD fall into four categories described as re-experiencing, avoidance, negative cognitions and mood, and arousal.

Based on ‘Diagnostic and Statistical Manual of Mental Disorders’ Fifth Edition (DSM-5).