The correct way to measure blood pressure is to measure both sides of the blood pressure for the first time. If the difference in pulse pressure is within a reasonable range, the side with the higher blood pressure will generally be taken as the standard for subsequent measurements. If the difference in pulse pressure is large, it is necessary to find out the reason and measure both sides of the blood pressure regularly. Generally speaking, the difference between the blood pressure of the right hand and that of the left hand exists to a certain extent, usually around 5~10mmHg. If the blood pressure values of the right and left upper limbs are about the same, the higher blood pressure will usually prevail, and if the higher side of the blood pressure is within the normal range, then the lower side is usually normal as well. If the higher side is within the normal range, the lower side is usually normal. However, there are a few people who have low blood pressure, so it is best to measure both sides of the blood pressure. If the difference between the blood pressure values of the right and left upper limbs is relatively large, or even more than 20mmHg, it is necessary to be alert to the existence of macrovascular disease. It is necessary to follow the doctor’s advice to consult the doctor for examination and treatment without delay. If the blood pressure is high, you need to choose the appropriate antihypertensive method according to your personal situation under the guidance of your doctor, and you should not blindly take medication or change the medication on your own.