There is no clear cause for primary hypertension, and secondary hypertension can be seen in renal artery stenosis, diseases of the kidneys themselves, adrenal gland diseases, and so on. Most of the hypertensive patients are mostly with primary hypertension. The cause of the onset of the disease is not yet clear, and it may be related to multiple factors, such as mental stress, overwork, high salt diet, family genetics, etc. There is no clear which is the specific cause of elevated high blood pressure. Some patients with secondary hypertension may have renal artery stenosis, leading to elevated renin levels and elevated blood pressure. Diseases of the kidneys themselves, such as acute and chronic nephritis and nephrotic syndrome, can also increase blood pressure, and may be associated with a decline in kidney function, leading to sodium retention in the body. Adrenal diseases can also lead to increased blood pressure, such as pheochromocytoma. Patients with high blood pressure should pay attention to finding the cause while actively treating it, and give treatment under the guidance of physicians.