Blood pressure is the pressure that blood exerts on blood vessels as it flows. Blood pressure can be divided into arterial blood pressure, venous blood pressure and capillary pressure, depending on the location. Blood pressure is commonly referred to as the arterial blood pressure of the body circulation. There are many factors that affect blood pressure, such as myocardial contractility, blood volume, elasticity of blood vessels, resistance of blood vessels, output of the heart, etc. Blood pressure can fall if there is a decrease in myocardial contractility or insufficient blood volume (e.g., shock), etc.; it can rise if there is an increase in vascular tension or an increase in cardiac contractility, etc. Normal human blood pressure is 90-139/60-89 mmHg. If blood pressure is too high, it can cause atherosclerosis, changes in the structure and function of the heart muscle, etc., and it can cause cardiovascular disease, so for patients with hypertension, regardless of whether they have symptoms of hypertension, they should actively and smoothly control their blood pressure to prevent other complications caused by hypertension. If blood pressure is too low, symptoms such as dizziness and weakness can occur, and low blood pressure is only given in the presence of these clinical symptoms. Therefore, attention should be paid to the monitoring of blood pressure, and once there is an abnormality in blood pressure, especially if there is hypertension, attention must be paid to the active control.