Low pressure 80mmHg during the day, 95mmHg at night this situation can not be determined whether normal, if it is due to emotions, exercise and other influences caused by a transient increase in blood pressure is normal, if it is not on the same day more than three times the low pressure is higher than 90mmHg is not normal, can be diagnosed as high blood pressure. 1. Physiological: Normal blood pressure fluctuates during the day, and low pressure within 60~89mmHg is normal, if the sympathetic nerve is excited by night exercise, mood change, drinking strong tea, etc., the blood pressure rises, and the low pressure is ≥90mmHg, and the measurement can be restored to the normal range after calming down, which is generally considered as normal. 2. Pathological: If the low pressure is higher than 90mmHg in more than 3 measurements on the same day, it is not normal in accordance with the diagnostic standard of hypertension. If the patient’s low pressure is 80mmHg during the day and 95mmHg at night, it is recommended to go to the hospital, clarify the cause under the guidance of the doctor and give standardized treatment.