Hypertension is divided into two categories: primary and secondary hypertension, the incidence of which is increasing year by year and has the following characteristics: 1. Low awareness rate: the initial symptoms of hypertension are not obvious, and only when there is headache, flushing, and panic, do they go to the hospital for physical examination, when the blood pressure is high, and even systolic blood pressure reaches more than 200 mmHg; 2.