The tension lever higher than the normal pressure required by blood circulation is called high blood pressure or Hypertension. Two different values are monitored when measuring blood pressure: Systolic and diastolic blood pressures. Systolic pressure is measured when the heart contracts while diastolic is measured when it relaxes.
The condition of having higher than normal levels of systolic or diastolic blood pressure is called Hypertension. Normal levels are accepted 140 mmHg for systolic and 90 mmHg for diastolic pressures. In other words any figure exceeding these levels is adequate to call the condition as Hypertension.