- PTSD (Post-traumatic stress disorder) : - PTSD (Post-traumatic stress disorder) : PTSD is the acronym of Post-traumatic stress disorder which refers to anxiety disorder in which the individual experiences several distressing symptoms for more than a month following a traumatic event, such as a re-experiencing of the traumatic event, an avoidance of reminders of the trauma, a numbing of general responsiveness, and increased arousal.