Posttraumatic stress disorder (PTSD) is a condition that may occur in people who have experienced or witnessed a traumatic event such as serious accident, rape, threatened with death, sexual violence, serious injury, a terrorist act, or war/combat. Most people who go through traumatic events may have temporary difficulty adjusting and coping. Many individuals develop symptoms within three months of the trauma, but symptoms may appear later and often persist for months and sometimes years. PTSD often occurs with other related conditions, such as depression, substance use, memory problems and other physical and mental health problems.