Heart rate of about 100, to the hospital to find the cause, if there is a cause, need to actively treat the original disease. It may be caused by physiological reasons, such as sinus tachycardia triggered by running, nervousness, or drinking coffee, which is not dangerous and does not need to be treated, and usually improves after rest. There may also be pathological causes of fast heartbeat, such as hyperthyroidism, severe anemia, infection, fever, etc., as well as heart failure may make the sympathetic nerve excitation, resulting in increased heart rate, need to actively treat the primary disease. Especially in the resting state, the heart rate is often about 100 beats / min, to consider the possibility of the existence of the above diseases. In addition, cardiac neurosis should be excluded.