Trauma is a person’s emotional response to a distressing experience. Few people can go through life without encountering some kind of trauma. Unlike ordinary hardships, traumatic events tend to be sudden and unpredictable, involve a serious threat to life—like bodily injury or death—and feel beyond a person’s control. Most important, events are traumatic to the degree that they undermine a person's sense of safety in the world and create a sense that catastrophe could strike at any time. Parental loss in childhood, auto accidents, physical violence, sexual assault, military combat experiences, the unexpected loss of a loved one are commonly traumatic events.