Mental/emotional stress caused the same physiological response of a "vegetative crisis" in 20 subjects with normal blood pressure, 21 subjects with borderline arterial hypertension and in 21 hypertensive patients. The change of arterial blood pressure, pulse, excretion of urine, noradrenaline, adrenaline were analogous in all three groups. The mathematical statistics technique revealed a difference in mechanisms regulating excretion of noradrenaline and adrenaline in subjects with normal blood pressure, borderline arterial hypertension and in hypertensive patients.