High blood pressure, also called hypertension, is blood pressure that is higher than normal. Your blood pressure changes throughout the day based on your activities. Having blood pressure measures consistently above normal may result in a diagnosis of high blood pressure (or hypertension).A normal blood pressure level is less than 120/80 mmHg.1 The higher your blood pressure levels, the more risk you have for other health problems, such as heart disease, heart attack, and stroke.