If the patient’s heart rate is 100 beats per minute in resting state, this situation is actually abnormal and belongs to tachycardia, it is recommended that the patient can do dynamic electrocardiogram if necessary to clarify the overall average heart rate in 24 hours, and should also be further examined to find out what triggers this accelerated heart rate. Relatively common causes include electrolyte disorders, anemia, hyperthyroidism, as well as fever and heart failure. If necessary, blood tests, serum electrolytes, thyroid function, cardiac ultrasound, and BNP tests should be performed to determine the cause of the tachycardia. If there is a current inflammatory infection, or if the patient has taken specific medications such as theophyllines, like aminophylline and doxophylline, the same rapid heartbeat can occur after medication.