What are the stages of hypertension? Hypertension is generally categorized by stage. Stage one hypertension is a more mild disease in which systolic blood pressure of 130 to 139 millimeters of mercury or a diastolic blood pressure of 80 to 89 millimeters of mercury. Stage two hypertension is more severe disease where systolic blood pressure is at least 140 millimeters of mercury, and diastolic is at least 90 millimeters of mercury. Stage one hypertension can often be controlled by lifestyle changes such as diet and exercise. Occasionally it can require one or two medications. Stage two hypertension is more severe and requires typically more than one medication to control.