It is a normal physiological phenomenon for blood pressure to be high in the morning, high in the evening and low in the afternoon. Clinically, blood pressure mainly refers to arterial blood pressure, which can be expressed as systolic blood pressure, diastolic blood pressure, pulse pressure difference and mean arterial pressure. Normal blood pressure fluctuations in the regularity of day and night, usually the majority of people’s blood pressure in the morning from 2:00 to 3:00 will be at the lowest level, and in the morning after waking up to go to work during this time, such as 6:00 a.m. to 10:00 a.m. or so there will be a peak. 10:00 a.m. after the blood pressure will gradually decline, this time in the trough of the state, so the midday blood pressure is low. The second peak occurs from 4 p.m. to 8 p.m. After 8 p.m., the blood pressure will show a slow decline, which is clinically known as the phenomenon of double peaks and double valleys, and is common in the elderly and hypertensive patients. This is a normal physiological phenomenon, do not worry too much, and do not need special treatment. If you find abnormal blood pressure, it is recommended that you go to the cardiovascular department of a regular hospital in time, complete the examination, make a clear diagnosis, and follow the doctor’s instructions for treatment.