Normal human blood pressure is less than 140 mmHg systolic and less than 90 mmHg diastolic. blood pressure fluctuations are different for each person, and there are two peaks in a person’s day, with the first peak from 9:00 a.m. to 10:00 a.m.; and the second peak from 3:00 p.m. to 4:00 p.m. During the peak phase, blood pressure is higher, so if you want accurate blood pressure measurement, it is generally best to measure blood pressure in the early morning, when it is more stable. If there are serious fluctuations in blood pressure, you need to go to the hospital for some specific examination and consultation. In addition, it is important to take blood pressure lowering medications regularly, regularly and quantitatively, and to do a good job of cardiovascular preventive care.