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A common symptom that arises from traumatic experiences is hyperarousal (also called hypervigilance). Hyperarousal is the body’s way of remaining prepared. It is characterized by sleep disturbances, muscle tension, and a lower threshold for startle responses and can persist years after trauma occurs. It is also one of the primary diagnostic criteria for PTSD. Hyperarousal is a consequence of biological changes initiated by trauma. Although it serves as a means of self-protection after trauma, it can be detrimental. Hyperarousal can interfere with an individual’s ability to take the necessary time to assess and appropriately respond to specific input, such as loud noises or sudden movements. Sometimes, hyperarousal can produce overreactions to situations perceived as dangerous when, in fact, the circumstances are safe.

Source: https://www.ncbi.nlm.nih.gov/books/NBK207191/

 

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