According to the Centres for Disease Control and Prevention, the normal pressure level should be less than 120/80 mmHg. You are at risk of prehypertension in case of systolic: 120–139 mm Hg and diastolic: 80–89 mm Hg. Moreover, hypertension is caused when the systolic is 140 mm Hg or higher and the diastolic is 90 mm Hg or higher., Health News, Times Now