Hypertension is categorized into two types: primary hypertension, whose cause is still unclear, and secondary hypertension, which is related to renal disease, endocrine disease, cardiovascular disease, etc. Most of the patients belong to primary hypertension. 1. Primary hypertension: the formation principle of primary hypertension is still unclear, which may be related to genetic factors, dietary factors, age factors, etc. Most patients belong to primary hypertension, which is generally difficult to be cured, but the development of the disease can be controlled through medication and dietary adjustments. 2. Causes of secondary hypertension: renal diseases such as glomerulonephritis, congenital renal lesions, secondary renal lesions; endocrine diseases such as hypercortisolism, hyperthyroidism, hyperpituitary gland; cardiovascular diseases such as complete atrioventricular block, polyarteritis, aortic valve insufficiency and so on, which may induce secondary hypertension. Hypertension should be treated actively, and medication should be taken under the guidance of a doctor to slow down the progression of the disease and prevent complications.