The danger of hypertension is still very serious, the main danger is to cause vascular damage, especially in important organs, such as the heart, brain, eyes, kidney blood vessels, etc.. Hypertension can cause left ventricular hypertrophy and dilation, called hypertensive heart disease. Left ventricular hypertrophy can cause a decrease in coronary blood flow reserve, leading to subendocardial myocardial ischemia. Hypertension is also a serious risk to the eyes. Small retinal arteries spasm early and sclerosis occurs as the disease progresses, and a sudden rise in blood pressure can cause retinal exudation and hemorrhage. The impact of hypertension on the kidneys is also very great, such as the emergence of renal arteriosclerosis, resulting in renal parenchymal ischemia and kidney units continue to reduce, and some will gradually develop into chronic renal failure, especially in the combination of diabetes, seriously affecting the quality of life of patients. If a patient is determined to be hypertensive, he should generally control his blood pressure below 90 mm Hg diastolic and 140 mm Hg systolic, regularly review his heart ultrasound, kidney function, fundus examination, and cerebral artery examination, and a low-salt diet is also very important to ensure sleep quality, etc.