Posttraumatic Stress Disorder (PTSD) By John W Barnhill, MD, New York-Presbyterian Hospital Reviewed / Revised Apr 2020 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Topic Resources Overview of Posttraumatic... Posttraumatic stress disorder (PTSD) is recurring, intrusive recollections of an overwhelming traumatic event; recollections last > 1 month and begin within 6 months of the event.