Post Traumatic Stress Disorder Symptoms Headache . Post-traumatic stress disorder (PTSD) is a disorder that develops in some people who have experienced a shocking, scary, or dangerous event. It can have long-term effects, including flashbacks, difficulty sleeping, and anxiety. An Introduction to Post-Traumatic Stress Disorder (PTSD) (Susie Hill) PTSD can leave you feeling stuck with a constant sense of danger and painful memories. Do you struggle with chronic flashbacks, nightmares, or persistent emotional numbness from a disturbing event or serious injury? It can have long-term effects, including flashbacks, difficulty sleeping, and anxiety. Post-traumatic stress disorder should be suspected if the person has experienced a traumatic event and presents with any of the following: Re-experiencing symptoms — which may occur in the daytime when the person is awake (flashbacks, or intrusive images or thoughts) or as nightmares when asleep. Learn about PTSD sympt...