Hypertension classification criteria and grouping

Hypertension is a common disease nowadays. According to the degree of blood pressure increase, hypertension can be divided into Grade I hypertension, Grade II hypertension and Grade III hypertension. Grade I hypertension refers to systolic blood pressure of 140-159mmHg and diastolic blood pressure of 90-99mmHg; Grade II hypertension refers to systolic blood pressure of 160-179mmHg and diastolic blood pressure of 100-109mmHg; Grade III hypertension refers to systolic blood pressure greater than 180mmHg and diastolic blood pressure greater than 110mmHg.