The causes of high blood pressure and low blood pressure are as follows: First, high blood pressure may be the primary blood pressure, the cause of which is mostly hereditary, or induced by eating salt and fat-containing foods, obesity, smoking history, etc.; Second, high blood pressure may be caused by other diseases secondary to secondary hypertension such as renal hypertension, renal insufficiency, glomerulonephritis, nephrotic syndrome, renal artery stenosis, etc.; Third, in addition to renal disease, there may be aldosterone system disorders causing elevated blood pressure, such as primary aldosteronism, secondary elevation of blood pressure. In addition to renal disease, there may be aldosterone system diseases that cause elevated blood pressure, such as primary aldosteronism, secondary blood pressure; Fourth, adrenal disease, pheochromocytoma and other diseases can cause elevated blood pressure; Fifth, in addition to disease, there are physiological factors that can cause high blood pressure, such as sleep deprivation, emotional excitement, strenuous labor, and so on.