While any traumatic event can cause PTSD, certain events are more likely to cause the disorder in those who experience them. PTSD is especially common among those who have served in combat, where is it sometimes called “shell shock.” Other events with a high potential for causing PTSD include seeing someone killed or seriously injured, living through a major natural disaster, and experiencing a life-threatening accident.

While there are several factors that determine if a person will develop PTSD, some of which are yet to be elucidated, certain factors can increase the likelihood that you will develop PTSD subsequent to experiencing a traumatic event. These risk factors include:  

• The traumatic event was especially severe or intense.
• The traumatic event was ongoing or lasted a long time.
• You were very close to or directly involved in the traumatic event.
• Your reaction to the event was very strong.
• You felt a total lack of control during the event.
• Someone close to you was killed or injured as a result of the trauma.
• You have an existing mental health condition.
• You lack a support system of family and friends or you do not seek help from such a support system.
• You have family members with a history of PTSD or depression.