According to the difference of elevated blood pressure, hypertension is divided into three grades:

Critical hypertension: systolic blood pressure140 ~150 mmhg; Diastolic pressure 90 ~ 95 mmhg

1 grade hypertension (mild): systolic blood pressure140 ~159 mmhg; Diastolic pressure 90 ~ 99 mmhg

Grade 2 hypertension (moderate): systolic blood pressure160 ~179 mmhg; Diastolic pressure100 ~109 mmhg;

Grade 3 hypertension (severe): systolic blood pressure ≥180 mmhg; Diastolic pressure ≥ 1 10mmHg.

Isolated systolic hypertension: systolic blood pressure ≥1.40 mmhg; diastolic pressure