What causes post traumatic stress disorder (ptsd) in teenagers? Ptsd is caused when a child or teen experiences or witnesses a traumatic event in their lives. This event can be a one-time occurrence, or it can be a repetitive experience. However, one child may experience a similar traumatic event as another child, and not develop ptsd. Research from saint louis university finds treatment for post-traumatic stress disorder (ptsd) that leads to an improvement in symptoms was associated with a 49 percent lower risk of incident type. posttraumatic stress disorder (ptsd) is a set of symptoms feeling jittery, sleeping problems, trouble concentrating that someone develops after they experience something harmful, terrifying, or upsetting. Teen post-traumatic stress disorder (ptsd) is an anxiety disorder that follows a specific traumatic event in a persons life. Some of the common traumatic events that can lead to the disorder include witnessing a death, experiencing a life-threatening situation, sexual assault, experiencing a natural disaster, or physical assault. You may have heard from doctors or your childs therapist that your child is suffering from post-traumatic stress disorder. However, you may now fully understand what this disorder is and that it can be completely cured with the right treatment from a qualified treatment center. There are various causes of post traumatic stress disorder in teens.