Post-traumatic stress disorder (PTSD) can develop after experiencing or witnessing a traumatic event that involved threat of death or serious injury. Symptoms include intrusive memories of the event, avoidance of trauma-related stimuli, increased anxiety and emotional arousal. Treatment options include psychotherapy, support groups, relaxation training, physical activity, and medication in severe cases. Improving mental health services and increasing resources for patients are important to provide proper treatment and support.