There is no adverse effect on human health if blood pressure is measured several times in a day. Measuring blood pressure several times during the day has no adverse effect on human health, but it may cause emotional anxiety and stress, which may affect the accuracy of the measurement results. Generally speaking, it is sufficient to measure blood pressure two to three times during the day when it is at its peak, and there is no need for frequent measurements. Blood pressure is at a high fluctuating level during the day, begins to fall gradually in the evening, then rises sharply after 3:00 a.m., and reaches its peak at about 7:00 a.m. Blood pressure then continues to fluctuate at a high level. Human blood pressure is divided into two parts, systolic and diastolic, of which the normal range of systolic blood pressure is 90 to 140 mmHg, and the normal range of diastolic blood pressure is 60 to 90 mmHg. If multiple measurements on a day other than the same day are not within the normal range, please seek medical attention.