Posttraumatic stress disorder (PTSD) is a mental disorder that can develop after a person is exposed to one or more traumatic events, such as sexual assault, warfare, traffic collisions, terrorism or other threats on a person's life. Symptoms include disturbing thoughts or feelings related to past traumas intruding on the present, avoidance of trauma-related cues, alterations in how a person thinks and feels about themselves and the world, and hyperarousal, persisting for more than a month after a traumatic event.
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