It is generally believed that blood pressure measured in the early morning on an empty stomach in a quiet state is the most accurate. Before measuring blood pressure, let the patient rest quietly for 5-10 minutes, do not exercise strenuously, do not hold urine, and do not eat too many excitatory fluids before measuring blood pressure, such as coffee, tea or wine, which may cause sympathetic excitement and release too many catecholamines and dopamine, which can easily induce an increase in blood pressure. If you want to monitor blood pressure, it is usually recommended that patients measure blood pressure three times a day, at the following times: 1) early morning blood pressure: the patient’s blood pressure in the early morning after waking up, measured at 6-10 am; 2) afternoon blood pressure: measured at 16-20 pm; 3) bedtime blood pressure: usually measured at 20-22 pm. Human blood pressure is regulated throughout the day according to the biological clock, and the majority of blood pressure is in the shape of an arytenoid, commonly known as “two peaks and a valley”, that is, the blood pressure reaches its peak in the early morning and afternoon, while the other periods will be relatively lower, so choose these times to measure blood pressure, can be very good to find the peak of blood pressure throughout the day, used to identify patients It can be used to identify whether a patient has high blood pressure. In addition, measuring blood pressure at bedtime can be compared to daytime blood pressure to see if the patient has inverse arytenoid blood pressure. This way of monitoring blood pressure is useful for adjusting blood pressure for the patient.