Posttraumatic Stress Disorder
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State
Posttraumatic stress disorder can follow exposure to a traumatic event and involves intrusion symptoms, avoidance, negative mood changes, and heightened arousal.
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A survivor re-experiences the event involuntarily, avoids reminders, and remains startle-prone months afterward.
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Most people exposed to trauma do not develop the disorder. Exposure is a criterion, not a prediction.
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