About 90% of hypertension is primary hypertension, which has no clear cause and may be related to a variety of factors such as genetics and lifestyle, and requires lifelong oral antihypertensive medication to maintain blood pressure in the normal range to prevent damage to the heart, brain, kidneys and other organs. Nearly 10% of hypertension has a definite cause, called secondary hypertension, and if the cause is resolved, blood pressure can return to normal without the need for antihypertensive drugs. The common causes are as follows: adrenal diseases: primary and secondary aldosteronism, Cushing’s syndrome, pheochromocytoma, etc;