Posttraumatic stress disorder is characterized by three main types of symptoms:

• Re-experiencing the trauma through intrusive distressing recollections of the event, flashbacks, and nightmares.
• Emotional numbness and avoidance of places, people, and activities that are reminders of the trauma.
• Increased arousal such as difficulty sleeping and concentrating, feeling jumpy, and being easily irritated and angered.

PTSD is diagnosed after a person experiences symptoms for at least one month following a traumatic event. However symptoms may not appear until several months or even years later.

Screen yourself or a family member for PTSD.

Check out the mobile app PTSD Coach, from the U.S. Department of Veterans Affairs.