Blood pressure measurements in the left and right arms are inconsistent, but not by much. If the difference is too great, there may be a pathologic factor.
Generally, the blood pressure of the right arm is higher than that of the left arm, which is due to the fact that the brachial artery of the right arm originates from the branch of the cephalic trunk and the brachial artery of the left arm originates from the branch of the left subclavian artery, which both come from the aorta, and the cephalic trunk branch is thicker than the branch of the left subclavian artery, but the difference in the pressure of the two arms will not be more than 5 to 10 mmHg.
If the pressure difference between the two upper arms is more than 10-15 mmHg, there may be pathologic factors, such as stenosis of the subclavian artery and other vascular-related diseases, and such patients may experience dizziness, nausea and other symptoms.
If the bilateral upper arm pressure difference exceeds the normal range, with or without dizziness and other discomforts, it is recommended to go to the hospital in time, and under the guidance of the doctor to give appropriate examination and treatment.