Hypertension is a relatively common cardiovascular disease in middle-aged and elderly people. Generally, systolic blood pressure over 140 mmHg and diastolic blood pressure over 90 mmHg can be characterized as hypertension, which can lead to cerebral infarction, coronary artery disease, chronic renal insufficiency, and retinopathy. Hypertension is divided into primary hypertension and secondary hypertension. Primary hypertension is called primary hypertension because the exact cause of the elevated blood pressure is unknown; the specific cause of the elevated blood can be found and is called secondary hypertension. Primary hypertension is more common in clinical practice, where the cause cannot be identified, accounting for more than 90% of cases, and this proportion will decrease year by year as the level of medicine improves. In recent years, scientific research has shown that primary hypertension is mostly caused by genetic and environmental factors, while secondary hypertension is caused by overweight and obesity due to improper diet, in addition to alcohol overdose and excessive nervousness, which may lead to secondary hypertension. Whether primary hypertension or secondary hypertension, all belong to the high-risk group and need to take medication regularly, test blood pressure regularly, do not eat foods high in sugar, fat and cholesterol, especially animal fat, and do not stop taking medication on your own during the medication period to avoid serious consequences.