Normal blood pressure shows a clear circadian rhythm, known as double peaks and valleys, which means that there are two peaks and one trough in blood pressure during the day. There is a peak at 6-10 a.m. and 4-8 p.m., and a trough at night when blood pressure is significantly lower. Blood pressure is affected by a variety of factors, including genetic factors, smoking, diet, mental stimulation, body weight, sleep apnea hypoventilation syndrome, and the use of certain medications. Hypertension can be diagnosed only if the blood pressure rises three times or more on the same day, and it is necessary to rest quietly for half an hour before measuring the blood pressure, and try to avoid noise, emotions and other factors that may interfere with the blood pressure. Blood pressure is subject to many interfering factors. Due to individual differences and life habits, each person’s peak blood pressure is not exactly the same, especially for hypertensive patients, whose blood pressure varies significantly, and some people even experience a significant increase in blood pressure at night. If there is any blood pressure abnormality, please go to the hospital in time to find out the cause and individualize the treatment, do not blindly use medication, so as not to delay the condition.