What is the term for disturbed behaviour that occurs after a major stressful event?

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Post-traumatic stress disorder (PTSD) is a mental health disorder that is triggered by a traumatic event, such as a natural disaster, a serious accident or injury, or a violent personal assault. Symptoms may include flashbacks, nightmares, and severe anxiety, as well as uncontrollable thoughts about the event. It is considered a normal response to an abnormal situation and may require professional treatment.

What Is the Term for Disturbed Behaviour That Occurs After