It is normal for blood pressure measurements to be different within a 2-minute interval. If the difference between the two readings is >10mmHg, it may be caused by factors such as exertion, emotional changes, and nervousness. Blood pressure fluctuates from time to time, and it is recommended to take at least two measurements with a time interval of 1~2 minutes and take the average value. It is normal for the two measurements to be different. If the difference between the two readings of systolic or diastolic blood pressure is >10mmHg, it may be caused by factors such as fatigue, emotional changes, stress, etc. At this time, the measurement should be taken again, and the average of the three readings should be taken as the measurement result. Blood pressure is affected by smoking, drinking alcohol, coffee or strong tea, mood swings, etc. Therefore, half an hour before the measurement, smoking is prohibited, strong tea or coffee is prohibited, urine emptying, maintaining emotional stability, and resting for at least 5 minutes before the measurement. This will give you a relatively accurate measurement of your blood pressure. Blood pressure should be measured on a regular basis. If your blood pressure fluctuates greatly or if you feel unwell, you should seek medical advice and treatment according to your doctor’s instructions.