Left-handed and right-handed measurement of blood pressure for normal people is not much difference, the reasons for the difference are as follows: 1, for the habit of using the right hand or the habit of using the left hand of the person, the force of the arm blood pressure can be higher than the opposite side of the 5mmHg, but does not affect the determination of high blood pressure, the patient for the first time the measurement of blood pressure, usually measured on both sides of the hand, and later measurement of blood pressure on the side of the higher; 2, the right and left-handed blood pressure is really different, the difference is very large, such as more than 20mmHg, you need to check whether it is aortitis, vascular occlusions, etc., and need to be examined by a professional through the CT or CT enhanced examination.