If a patient tends to feel nervous every time his blood pressure is measured, it can easily lead to a faster heart rate and higher blood pressure. In clinical practice, this phenomenon is called white coat hypertension, and the patient will have this nervous feeling as long as he is measured in the office or by someone wearing a white coat. It is recommended that the patient have a ambulatory blood pressure monitoring if necessary, which can more objectively reflect the overall blood pressure situation of the patient for 24 hours and avoid the elevation of blood pressure caused by nervousness. For patients with abnormal blood pressure, it is often not possible to judge whether the patient is hypertensive by a single measurement, but needs to be measured three times on non-same day, and before the blood pressure measurement, let the patient urinate at least once, and do not eat, smoke or drink alcohol before the measurement, and rest for at least 10-15 minutes, relatively speaking, the measured blood pressure is the most accurate.