Natural Ways to Lower Blood Pressure PDF free Download.Normal blood pressure is a systolic blood pressure less than 120 mm Hg, and a diastolic blood pressure less than 80 mmHg. Many advocate for BP to be under 115/75 due to the research which has shown that a rise in BP over this range increases risk of heart disease. One who has a blood pressure of under 120/80 should be screened for hypertension every 2 years. If the blood pressure is 120-139/80-90, one should be screened every year and take action to lower blood pressure to 120/80. If blood pressure is 139/90 or higher for the upper or the lower number, consult a physician. There are some high BP emergencies: Hypertensive urgency is a diastolic blood pressure of 120 mmHg or higher which is not causing any symptoms or damage to organs. Malignant hypertension is characterized by a diastolic blood pressure over 100 mmHg with visual changes (blurred vision, double vision or vision loss), or altered mental status (confusion).