Any event that is physically or psychologically traumatic can cause PTSD. Natural disasters, military combat, abuse in childhood, violent or sexual assault, road accidents, and terrorist attacks are just some of the common causes. It is unclear why some people develop PTSD after a traumatic experience while others do not, but it is certainly not a reflection of one’s character, intelligence, or strength. PTSD can develop immediately after a life-altering experience or may lie dormant for several weeks, months, or longer.