Blood pressure fluctuations peak at 8:00-10:00 in the morning and 16:00-18:00 in the afternoon. In the human physiological state, blood pressure has a diurnal fluctuation pattern. After waking up in the morning, the body’s functions begin to mobilize, all kinds of hormone levels will also produce corresponding changes, at this time the blood pressure is affected by the gradual increase, generally to 8:00-10:00 in the morning to reach the peak. At this time is also the body’s energy, high-intensity operation of the time period, so the need for higher blood pressure to maintain bodily functions. Similarly, the afternoon 16:00-18:00 is also the more active time of the day, so blood pressure is higher, but at noon or night, blood pressure is relatively low. However, in the case of pathological conditions, a blood pressure above 140/90 mmHg at any time of day is a diagnostic criterion for hypertension. Therefore, patients are advised to monitor their blood pressure status at all times and to visit the cardiovascular medicine department whenever hypertension occurs or if they have any uncomfortable symptoms.