The systolic and diastolic pressures are measured using a device known as Sphygmomanometer. In general, a person is said to have High Blood Pressure if the systolic pressure is greater than or equal to 140mm Hg and diastolic pressure greater than or equal to 90mm Hg. It is necessary to maintain a lower pressure because for every 20mm Hg of systolic pressure raises above 115 and for every 10mm Hg of diastolic pressure raises above 75. The different Hypertensive stages are normal, pre-hypertension, stage-1, and stage-2. In case of normal the systolic pressure remains below 120mm Hg and diastolic pressure remains below 80mm Hg and no treatment is required but regular check-up is needed so that the blood pressure is not raised. Pre-hypertension is a case where the systolic pressure is between 120-139m Hg and diastolic pressure is between 80-89mm Hg and it is a stage where the risk for developing hypertension is high. Stage-1, is where the systolic pressure is between 140-159mm Hg and the diastolic pressure is between 90-99mm Hg, the medications are followed as per pre-hypertension but also the use of drugs is advised in order to reduce the risk of developing heart diseases. Stage-2 is the severe case where the systolic pressure is 160mm Hg or higher and the diastolic pressure is 100mm Hg or higher. A very high dosage level of drugs is used in order to bring the blood pressure down in this case.