PTSD can develop after a person experiences a traumatic event that is beyond a    typical stressor.

According to the NIH (National Institute of Health), People who experience PTSD may have persistent, frightening thoughts and memories of the event(s), experience sleep problems, feel detached or numb, or may be easily startled. Events that may lead to PTSD include, but are not limited to, violent personal assaults, natural or human-caused disasters, accidents, combat, and other forms of violence. In severe forms, PTSD can significantly impair a person’s ability to function at work, at home, and socially.