Normal blood pressure is a range in which systolic blood pressure, or high pressure, should be between 90-140 mmHg; diastolic blood pressure, or low pressure, should be between 60-90 mmHg. If the systolic blood pressure is 102mmHg, it falls within the normal blood pressure range. If the diastolic pressure is 102mmHg, it is considered hypertension. If the diastolic blood pressure is 102 mmHg or higher for 3 consecutive days, the diagnosis of hypertension is confirmed. After the diagnosis of hypertension is made, the blood pressure is divided into first, second and third grade according to the value of blood pressure, and the systolic blood pressure ≥ 140mmHg or diastolic blood pressure ≥ 90mmHg is the first grade of hypertension. If the systolic blood pressure is ≥ 160 mmHg or diastolic blood pressure is ≥ 100 mmHg, it is Grade 2 hypertension. If the systolic blood pressure ≥ 180 mmHg or diastolic blood pressure ≥ 110 mmHg is hypertensive disease grade III.