The causes of persistently elevated hypertension are more complex. Hypertension is divided into primary hypertension and secondary hypertension. More than 90% of patients have primary hypertension, the cause of which is not very clear and is related to a variety of factors, including genetics, mental stress, stressful life, high salt diet, etc. 5%-10% of patients have secondary hypertension, such as pheochromocytoma and primary aldosteronism. Secondary hypertension can return to normal after treatment of the primary disease. If an increase in blood pressure is found, secondary hypertension should be excluded. When the diagnosis of primary hypertension is made, the blood pressure continues to increase and antihypertensive drugs should be taken to control the blood pressure in the normal range, and it is recommended to take antihypertensive drugs for a long time.