Normal blood pressure is higher in the right hand than in the left, which is the difference caused by the anatomical structure of the brachial artery of the left and right upper limbs, with the right upper limb higher than the left upper limb by 5mmHg, and the main cause of hypertension is atherosclerosis. The growth and development of the human body is not balanced, such as eating chopsticks with left-handed and right-handed, the human body’s left and right upper limbs and left and right lower limbs strength is also unbalanced, left and right development is also unbalanced, atherosclerosis if the right upper limb than the left upper limb is serious, there will be left upper limb than the right upper limb blood pressure is high, the difference between the two blood pressure is not very high, there is no need for special treatment, blood pressure reference value is based on the right upper limb. If the systolic blood pressure exceeds 140 mmHg is hypertension, only then do we need to actively intervene, low salt and low fat diet can ease the process of atherosclerosis.