The reason for the big difference between three consecutive measurements of blood pressure may be caused by factors such as different body positions, irregular measurement methods, short intervals between repeated measurements, damage to the sphygmomanometer, and may also be caused by white coat hypertension. 1. If the patient is in a different position during the three measurements, the difference in blood pressure can occur. 2. If the method of using the sphygmomanometer is not standardized during the measurement, such as the cuff is in the wrong position, emotional excitement before the measurement, and the elbow, the heart and the sphygmomanometer are not at the same level, etc., it can also lead to a big difference in blood pressure between the three consecutive measurements. 3. If the interval between three measurements is too short, resulting in poor arterial filling, this symptom may also occur. 4. In addition, if the sphygmomanometer is damaged and the blood pressure cannot be measured correctly, a large difference in blood pressure between three consecutive measurements can also occur. 5. Patients with white coat hypertension may also experience the above phenomenon, as they may feel nervous and anxious when medical personnel are on site, resulting in an increase in blood pressure. If the patient is self-conducted, or if the medical staff leaves the scene, the blood pressure can be lowered, and the phenomenon of three consecutive measurements of blood pressure with a large difference occurs. If the patient’s blood pressure varies greatly for three consecutive measurements, the patient can change the sphygmomanometer after a break and take two to three blood pressure measurements again; if the above phenomenon still occurs, it is recommended that the patient seeks medical treatment in a timely manner.