Human blood pressure is divided into systolic pressure and diastolic pressure, low pressure is diastolic pressure. Low pressure generally refers to the patient’s diastolic blood pressure <60mmHg in the resting state, improper diet, malnutrition, lack of sleep, overexertion, genetics, etc. may cause low diastolic blood pressure, the clinical more common are physiological factors, pathological factors, drug factors: 1, physiological factors: low diastolic blood pressure is most common in the elderly, the elderly due to the existence of varying degrees of degenerative changes in blood vessels This is a normal physiological phenomenon, which can lead to a decrease in diastolic blood pressure in the elderly due to different degrees of degenerative changes in blood vessels, resulting in a decrease in vascular elasticity and different degrees of atherosclerosis. Therefore, in the elderly population, there is usually a high systolic pressure and low diastolic pressure with a large pulse pressure difference. For elderly people with hypertension, diabetes or hyperlipidemia, it is more common to have an increased pulse pressure difference and low diastolic blood pressure. In addition, improper diet, malnutrition, sleep deprivation, overexertion, congenital genetics and other factors can also lead to low diastolic blood pressure; 2, pathological factors: low diastolic blood pressure may be due to various disease factors, clinically common aortic valve closure insufficiency, hyperthyroidism, severe anemia, rheumatic heart disease, these diseases may lead to a decrease in diastolic blood pressure, increased pulse pressure. . In addition, severe active gastrointestinal bleeding, acute myocardial infarction, massive cardiogenic shock and other diseases may lead to a state of severe hypotension, the patient may show a decrease in both diastolic and systolic blood pressure; 3, drug factors: for example, hypertensive patients taking long-term antihypertensive drugs, if the type or dose of antihypertensive drugs is not appropriate, it may cause a significant decline in diastolic blood pressure, resulting in Patients have low diastolic blood pressure.