Hypertension is divided into three levels, the main grading criteria is the increase in blood pressure level: first, hypertension level 1, if the high pressure ≥ 140mmHg, < 160mmHg or low pressure ≥ 90, < 1000mmHg, this blood pressure level belongs to hypertension level 1, hypertension level 1 has the least impact on the human body; second, hypertension level 2, if high pressure ≥ 160mmHg, < 180mmHg or low pressure ≥1000mmHg, <110mmHg, this blood pressure level belongs to hypertension level 2, such blood pressure heart, brain, kidney and other organ damage risk significantly higher; third, hypertension level 3, if the high pressure ≥1800mmHg or low pressure ≥1100mmHg, such blood pressure belongs to hypertension level 3, belong to the more dangerous blood pressure, must be standardized take medication down to a safe level.