Diastolic blood pressure is also called low pressure, the normal range of diastolic blood pressure should be 60~89mmHg, if the systolic blood pressure and diastolic blood pressure are low, it may be caused by blood volume insufficiency, if the systolic blood pressure is normal, the diastolic blood pressure is low, and the difference between the two pulse pressure is more than or equal to 60mmHg, it is possible that the thyroid gland may be hyperfunctioning and other diseases. Normal diastolic blood pressure should be 60~89mmHg, when the systolic blood pressure and diastolic blood pressure are low, the blood pressure is lower than 90/60mmHg, it is called low blood pressure, acute low blood pressure is common in shock, myocardial infarction, pericardial compression, etc.; Chronic low blood pressure may be related to the body constitution, generally asymptomatic, and may also be related to the body position, it is called postural low blood pressure. When the diastolic blood pressure is lowered, resulting in the pulse pressure difference between systolic and diastolic blood pressure is greater than or equal to 60mmHg, it can be seen in hyperthyroidism and other diseases. Symptoms of low blood pressure is best to consult a doctor in a timely manner, under the guidance of the doctor for treatment, daily attention to balanced nutrition, avoid staying up late, pay attention to rest.