The difference in blood pressure between the two arms is usually about 10-20 mmHg, and the higher side should be the main one for blood pressure measurement.
When measuring blood pressure, the blood pressure of the left and right upper arms should be measured, and then the arm with the higher blood pressure should be chosen as the daily monitoring arm. When measuring blood pressure, the arterial blood pressure of the right and left upper limbs will be different, and the normal range of the difference is 10-20 mmHg. If the difference is large, the systolic blood pressure is >20 mmHg, and the diastolic blood pressure is >10 mmHg, there may be peripheral vascular lesions.
Common peripheral vascular lesions that cause inter-arm blood pressure differences include upper extremity arterial stenosis, plaque, and congenital developmental abnormalities, with upper extremity arterial stenosis occurring in subclavian vein, axillary artery, and brachial artery in order of prevalence.
Therefore, when measuring the blood pressure of both upper limbs, we should pay attention to the changes of the difference between the blood pressure of both upper limbs, and pay attention to the difference that exceeds the normal range, and go to the hospital in time to see a doctor, and carry out professional evaluation and examination under the guidance of a professional doctor to clarify the cause of the disease.