The DSM definition of PTSD is quite straightforward: A person is exposed to a horrendous event “that involved actual or threatened death or serious injury, or a threat to the physical integrity of self or others,” causing “intense fear, helplessness, or horror,” which results in a variety of manifestations: intrusive reexperiencing of the event (flashbacks, bad dreams, feeling as if the event were occurring), persistent and crippling avoidance (of people, places, thoughts, or feelings associated with the trauma, sometimes with amnesia for important parts of it), and increased arousal
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