Both hands are capable of measuring blood pressure, but it is now generally recommended that the right hand measure blood pressure because the right arm is usually 5-10mmHg higher than the left arm, so the blood pressure is based on the higher side. Some studies have shown that when the difference in blood pressure between the right and left arms is often greater than 15mmHg, it means that there are problems with blood vessels, which may lead to cardiovascular obstruction in the long run. When measuring blood pressure, it is recommended that both the right and left arms are measured, and when the difference in blood pressure between the two sides is found to be greater than 15mmHg, we should pay attention to the changes in the body in time, and pay particular attention to diseases such as multiple aortitis, vascular malformations, stenosis, occlusions, and so on. Before measuring blood pressure, you should rest for a while, so as to avoid the influence of exercise and emotion on blood pressure, and the consumption of coffee and tea will also affect the normal value of blood pressure. Measurements should be saved and the time of each measurement should be recorded, so that problems can be provided to the doctor in time for a better diagnosis.