The nerves that control unconscious processes such as the heartbeat can sense distress and trigger a maladaptive fight-or-flight response that triggers blood vessels to constrict, the heart to gallop and blood pressure to rise, resulting in damage.
Živci koji upravljaju nesvjesnim procesima poput kucanja srca mogu osjetiti uznemirenost te radi brze prilagodbe izazvati reakciju "borba-ili-bijeg" koja čini da se krvne žile stežu, srce počne galopirati, krvni tlak se diže, a to sve završi štetno.