Lower pressure generally refers to diastolic blood pressure, diastolic blood pressure is 85mmHg for the first time and 75mmHg one minute later, belongs to the fluctuation of blood pressure, which may be caused by emotions and other physiological reasons, but also may be caused by the measurement is not standardized, antihypertensive drugs do not have the full effect, the existence of bad habits and other reasons. 1. Physiological reasons: short-term emotional fluctuations can lead to changes in blood pressure within a minute, for example, due to tension, anger, anxiety, etc., may appear in the first measurement of the lower pressure is 85mmHg, one minute after the measurement of the phenomenon of 75mmHg. At the same time different time people’s blood pressure can have slight fluctuations. 2. Measurement is not standardized: incorrect operation can lead to the measurement of the results of the difference is more obvious. Therefore, the first need to buy qualified blood pressure measurement products, and the second should be used correctly. 3. Antihypertensive drugs are not fully effective: some hypertensive patients will have obvious fluctuation of blood pressure in the early stage of taking antihypertensive drugs. 4. The existence of bad life habits: such as smoking, drinking, a lot of strong tea and coffee. The first amount of lower pressure is 85mmHg, which belongs to the threshold of the normal range. If physiological phenomena and measurement problems are ruled out, accompanied by discomfort, it is recommended to consult a doctor as soon as possible to find out the cause, and if necessary, treat it with medication.