Beyond Blue describes Post Traumatic Stress - "(PTSD) is a particular set of reactions that can develop in people who have been through a traumatic event. That is, they have experienced or witnessed an event which threatened their life or safety, or that of others around them, and led to feelings of intense fear, helplessness or horror." At times those suffering form PTSD might be triggered by something that pulls the sufferer back to the traumatic event as if it is happening in that very moment. This video offers a short explanation as to how this re-traumatization occurs and how a sufferer might cope with the event.