The 24-hour blood pressure monitor, or 24-hour ambulatory blood pressure monitoring as it is clinically referred to, looks most at data such as the average systolic and average diastolic blood pressure, the highest and lowest blood pressure values, and the curve of blood pressure changes monitored over a 24-hour period. Most ambulatory blood pressure monitoring is continuous for 24 hours, does not interfere with the patient’s daily activities, and allows for multiple measurements of blood pressure values to be obtained. Usually, the ambulatory blood pressure monitor takes one measurement in 15-30 minutes. 24-hour ambulatory blood pressure has a mean systolic blood pressure <130 mmHg and a mean diastolic blood pressure <80 mmHg. Daytime blood pressure has a mean systolic blood pressure <135 mmHg and diastolic blood pressure <85 mmHg; nighttime blood pressure has a mean systolic blood pressure <120 mmHg and diastolic blood pressure <70 mmHg. Percentage of normal values, if the parameter is >35% suggesting the possibility of abnormality, ≥50% is considered hypertension. Also normal blood pressure variation should show a long-handled spoon-shaped curve, which is often not demonstrated in those with abnormal blood pressure, especially in elderly patients or those with severe vascular sclerosis. If the diagnosis of hypertension is confirmed, you need to look at the highest blood pressure value and the lowest blood pressure value in 24 hours to determine the classification of hypertension. And under the guidance of a professional doctor, take the appropriate medication for treatment. In addition, it is recommended that hypertensive patients often perform 24-hour blood pressure monitoring, the results of which can determine the therapeutic effect of antihypertensive drugs for hypertensive patients and help guide the selection and dosage of antihypertensive drugs and control the timing of medication.