Our most straightforward definition of "trauma" - literally means wound, shock, or injury. Psychological trauma is a person's experience of emotional distress resulting from an event that overwhelms one's capacity to cope. The precipitating event may be a one-time occurrence (i.e., an assault or accident) or a series of occurrences (i.e., childhood neglect or abusive relationships) perceived as seriously harmful or life-threatening to oneself or loved ones. People process experiences differently, and not everyone has the same reaction to any event; what one person experiences as trauma may not cause distress for another.
For example, two people may get into a car accident. One person might drive away while the other person may never drive again.