People with hypertension are mainly worried about the complications of heart, brain, kidney and eye caused by hypertension. Patients with hypertension not only have elevated blood pressure, but also have damage to various target organs throughout the body due to the distribution of blood vessels in various substantive organs throughout the body, among which the four target organs of heart, brain, kidney and eye mentioned above are the most important: i. Heart side will mainly lead to heart failure, heart infarction, myocardial ischemia, etc.; ii. mainly have brain hemorrhage, cerebral infarction, etc.; third, the kidney for the main will appear glomerulopathy and lead to renal insufficiency, etc.; fourth, the eyes mainly will appear optic papillary edema, blurred vision, or even acute blindness, etc. Therefore, hypertension alone is not the only concern of the doctor, but the complications of each target organ caused by hypertension are the key issue. Therefore, cardiologists instruct their patients to maintain good blood pressure control until they develop complications due to hypertension in order to prevent irreversible complications.