The reasons why blood pressure is lower than the previous three measurements may include the following two points: changes in the patient’s own condition and different tightness of the cuff, which need to be analyzed specifically. 1. Changes in the patient’s condition: When the patient measures blood pressure, the first measurement may be due to the fact that he/she has just sat down, and his/her emotional and physical condition has not reached a calm state, and may be accompanied by nervousness, so that the value of the first measurement will be on the high side. During the second and third measurements, the patient’s mood and physical condition will become more and more relaxed, so the measured blood pressure level may gradually decrease. 2. Different cuffs: If the cuff is too tight, the sphygmomanometer will exert a certain pressure on the brachial artery before it is inflated and pressurized, so the pressure achieved by the sphygmomanometer will be lower, and the measured blood pressure will be low. If the cuff is too loose, the measured blood pressure will be high. If the blood pressure is lower than the previous three times, it may be because the cuff is getting tighter and tighter. If the blood pressure is lower than once three times, it may be due to the patient’s own reasons, or it may be due to the cuff’s loosening and tightening. Closely monitor the change of blood pressure to see if it is within the range of the normal blood pressure value (140~90/90~60mmHg), and if it decreases persistently, it is recommended to consult the doctor in time to make a clear diagnosis.