Aggression triggers in the brain (pituitary) an "alarm reaction" that stimulates secretion of corticotrophin (ACTH) and consequently of adrenocortical hormones to change the subject's psycho-physiological balance and trains especially a tachycardia, a respiratory hyperventilation and an arterial vasoconstriction. When stress remains a minor, he plays a positive role in improving resilience to pressure, not the same thing happens when aggression is very intense times when it is extended.

Stress-related disorders - Stress puts into play factors neurovegetative, endocrine or tissue. They cause symptoms whose location varies from individual to individual. The best known symptom is stomach ulcer: a repeated stimulus train network contraction pressure to irrigate the stomach lining. If stress persists, there is a disease (which causes circulatory failure or deterioration of tissue necrosis), responsible for bleeding or perforation of the stomach wall. Among other stress-related diseases figure cardiovascular disease (angora, myocardial infarction, hypertension), digestive (transit disorders, colitis, ulcers), skin (rash, alopecia or hair loss), endocrine (risk of serious decompensate of insufficient adrenal chronic), gynecological (ovulation disorders and / or menstrual flow). Stress can be the source of pain and ailments of neurovegetative origin (palpitations, feeling short of ailments without loss of consciousness, syncope), fatigue rebels from depression, insomnia, anorexia, even mental confusion.