Low pressure in blood pressure is also known as diastolic blood pressure. A diastolic blood pressure ≥ 90 mmHg without the use of antihypertensive drugs can be defined as hypertension. Clinical manifestations of high diastolic blood pressure are commonly seen in middle-aged hypertensive patients, accompanied by weight gain and increased peripheral vascular resistance, which may lead to damage to many organs: 1. Heart disease: Long-term elevated diastolic blood pressure may lead to increased cardiac load, stimulating cardiomyocytes to develop hypertrophy or interstitial fibrosis and other causes of left ventricular hypertrophy or dilation, which may be called hypertensive heart disease. It may also be accompanied by coronary arteriosclerosis or microangiopathy, etc., and symptoms such as myocardial ischemia may occur when oxygen consumption increases. If the heart disease is serious, organ failure or irreversible damage may occur; 2, brain disease: long-term high diastolic blood pressure may cause ischemia and deformation of cerebral vessels, there is a certain possibility of forming microaneurysms, cerebral atherosclerosis, cerebral small artery occlusive lesions and other diseases, easily triggering brain hemorrhage, cerebral thrombosis and other complications, serious life-threatening; 3, kidney disease: elevated diastolic blood pressure through the blood circulation The kidney can lead to increased pressure in the kidney capsule and many kidney diseases. Chronic renal failure is one of the serious consequences of long-term hypertension, such as combined with diabetes, may also appear in the short term renal failure; 4, retinal disease: diastolic blood pressure remains high for a long time, may appear small retinal artery spasm or sclerosis, resulting in retinal hypofunction. If blood pressure continues to be uncontrolled, it may also be complicated by bleeding and exudation when blood pressure rises rapidly. High diastolic blood pressure alone is also hypertension, and patients should pay attention to their physical condition. Patients should also pay attention to reasonable medication treatment in daily life, take antihypertensive drugs on time and regularly, maintain emotional stability, and try to avoid emotional excitement. When diastolic blood pressure is 90 mmHg, patients should actively go to the hospital for examination and symptomatic treatment to avoid delaying the appearance of the above symptoms. Go to the hospital regularly for physical examination to avoid complications of hypertension, etc.