Pulse and heart rate are two different concepts. Under normal circumstances, the frequency of the pulse, i.e. pulse rate, is the same as the heart rate; in some diseases, such as atrial fibrillation and peripheral vascular disease, the pulse rate and the heart rate may not be the same, and the pulse rate may be less than the heart rate, but the heart rate will never be less than the pulse rate. Pulse is the beat produced by the regular contraction of arterial vessels, while heart rate is the frequency of heart contraction, which are two different concepts. Normally, after a heart contraction, blood flows from the left ventricle of the heart to the arterial vessels, which causes regular contractions of the arterial vessels, allowing blood to continue to flow to the capillaries. Thus, the frequency of heart contraction is the same as the frequency of arterial vasoconstriction, i.e., the heart rate is equal to the pulse rate, and the two are the same. However, in some diseases, such as atrial fibrillation and peripheral vascular disease, because of myocardial contraction or arterial vascular occlusion, blood does not flow well from the left ventricle to the peripheral arterial vasculature, resulting in a decrease in arterial vasoconstriction, and thus the pulse rate is less than the heart rate. When uncomfortable symptoms occur, please go to the hospital and consult your physician for guidance.