PTSD is characterized by 4 clusters of symptoms 
• Reexperiencing Symptoms
Recurrent, intrusive memories, traumatic nightmares, and flashbacks.
• Avoidance Symptoms
Avoiding trauma related thoughts, people, objects, places
• Negative changes in cognitions & mood
Distorted beliefs, shame and guilt, alienation, not able to recall key moments
• Alterations in Arousal or reactivity
Irritability, hyper-vigilance, reckless, sleep disturbance
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