Posttraumatic stress disorder is an anxiety disorder that develops as a delayed reaction to having experienced or witnessed a shocking or frightening event.

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Posttraumatic stress disorder (PTSD) is an anxiety disorder that can develop after experiencing or witnessing a traumatic event, such as a natural disaster, combat, sexual or physical assault, or a serious accident. It can cause a range of symptoms, such as intrusive thoughts or memories of the event, avoidance of triggers that remind the person of the trauma, heightened arousal or reactivity, and negative alterations in mood or thinking. PTSD can develop immediately after the event or it may take months or even years to appear.

Posttraumatic Stress Disorder Is an Anxiety Disorder That Develops as a Delayed