PTSD is an acronym for post-traumatic stress disorder, which is a mental illness caused by someone experiencing extreme trauma. Most often, PTSD is thought of as an illness that affects soldiers who have been in active combat. However, anyone who witnessed or was involved in a traumatic event can acquire PTSD. These types of events can include car accidents, house fires, physical or sexual abuse, or witnessing a violent crime. Often, those with PTSD experience flashbacks of the traumatic event, and are unable to stop intrusive thoughts related to the event. They may blame themselves for the event or be unable to deal with feelings of guilt, distress, shame, or anger.