Using the main points and examples describe three categories of PTSD symptoms

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Post-Traumatic Stress Disorder is an anxiety disorder characterized by reliving a psychologically traumatic situation, long after any physical danger involved has passed, through flashbacks and nightmares. PTSD is caused by a psychologically traumatic event involving actual or threatened death or serious injury to oneself or others. Such triggering events are called ‘stressors’; they may be experienced alone or while in a large group.
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