Hypertension can be symptomatic or asymptomatic, such as the common symptoms of dizziness, headache, blurred vision, and even unstable walking in some people, while most patients have no symptoms. The presence or absence of symptoms cannot be used to judge whether a patient has hypertension or the severity of blood pressure. It is recommended that a sphygmomanometer be used to measure the patient’s blood pressure, and it is advocated that the blood pressure be measured several times in a quiet, resting state. The measured values are generally considered to be hypertensive when the systolic blood pressure is above 140 mmHg or the diastolic blood pressure is above 90 mmHg. If the average 24-hour ambulatory blood pressure is 130 mmHg or more systolic, or 80 mmHg or more diastolic, hypertension is considered to be present. Prevention of hypertension lies in moderate exercise and proper dietary control, and dietary control lies first in a low-salt diet. In addition, including a low-fat diet and a low-sugar diet, patients should also quit smoking and limit alcohol, take rest and avoid staying up late. If blood pressure is found to be elevated, it should be actively monitored and the values recorded for the outpatient follow-up physician to help guide the medication strategy.