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Heightened arousal, involves another group of posttraumatic stress symptoms, which can be manifested through sleep disturbances, increased feelings of anger and irritability, concentration difficulties, startle reactions, and hypervigilance.
Detailed measurements of facial muscles during the startle reaction suggest that it is probably a reflex, according to a report in the November JOURNAL OF PERSONALITY AND SOCIAL PSYCHOLOGY.
Sudden shocks - either building emotional terrors or simple startle reactions, cause stress hormones to pour out, messing with the heart's rhythm, putting more stress on certain parts of the arteries or muscles, or poisoning the muscles entirely.