It is normal for the heart rate to be around 100 beats per minute after surgery, which occurs on the first day of surgery. Due to the stimulation of the surgery or bleeding during the surgery, it is possible that the heart rate may be stimulated to show a corresponding increase in speed. If the normal basal heart rate is not 100 beats/minute, and such a fast heart rate occurs after the second day of surgery, it is not normal. It is possible that excessive bleeding after the surgery has led to insufficient blood volume and an increase in the heart rate. It is also possible that the surgery has stimulated other organs in the body, for example, arrhythmia in the cardiovascular system may also appear to increase the heart rate. In addition, a reactive fever can also occur after surgery, but as the fever gradually subsides, the heart rate will return to normal.