In normal people, the blood pressure in the right upper arm is generally 5-10 mmHg higher than that in the left upper arm. In normal people, the blood pressure of the right upper arm is higher than that of the left upper arm, and the general difference in blood pressure is 5-10 mmHg, which is called the difference in blood pressure between arms. However, if the blood pressure of the right arm is higher than that of the left arm by 20 mmHg or more, it may suggest the existence of vascular pathology, such as atherosclerosis, stenosis, etc., and it is necessary to further improve the vascular ultrasound to clarify the cause of the pathology. The right arm blood pressure is higher than the left arm due to the different vascular anatomy, the right arm blood pressure monitoring is the right brachial artery, from the branch of the head arm trunk, the left brachial artery is from the left subclavian artery, the head arm trunk is thicker than the left subclavian artery, so the right arm blood pressure is generally higher. In daily monitoring of blood pressure, the right arm blood pressure is generally prevail, if necessary, both sides need to check, if the difference between the two sides of the blood pressure value is too large, it is recommended to consult a doctor in time.