Hypertension afflicts so many people from all walks of life all over the world. This is known as a traitor disease because some people may have it for years and not manifest any symptoms. Blood pressure has two parts systolic pressure (upper value) and the diastolic pressure (lower value). Normal value for blood pressure is established as 120/80 mmHg. Prehypertension is a condition wherein systole is 120-138 mmHg or diastole is 80-89 mmHg. Hypertension is stage one is the systole is 140 â€“ 159 mmHg or diastole is 90 â€“ 99 mmHg. It is in stage two if the systole is above 160 mmHg or diastole is 100 mmHg and above.