It is a normal physiological phenomenon for most adults to find different blood pressure values in the left arm and the right arm when the patient’s blood pressure is measured. The reason for this is that the right brachial artery comes from the first major branch of the aortic arch, while the left brachial artery comes from the third major branch of the aorta, the left subclavian artery, and the energy consumption of the left and right arms is different. The energy consumption of the left and right arms is also different, so the blood pressure of the right arm is often higher than the blood pressure of the left arm when measuring blood pressure results. In addition, the difference in blood pressure between the left arm and the right arm may be related to pathological factors. Some patients suffering from aortic coarctation, aortic constriction, atherosclerosis, and other diseases may have arterial stenosis and atherosclerosis, which may also trigger the above phenomenon.