Whether sinus tachycardia is dangerous or not also requires a scientific risk assessment based on a comprehensive analysis of the patient’s medical history and ancillary test results. Normal human heart rate is 60-100 beats per minute, and a heart rate of more than 100 beats per minute and above is called sinus tachycardia. A heart rate of 60 beats per minute or less is called sinus bradycardia. Physiological sinus tachycardia is very common, such as emotional excitement, shock, sleep disorders, anxiety, fatigue, etc., can lead to accelerated heart rate, adjust the mood, when the body and mind are quiet, the heart rate will return to normal, do not have to worry about it, the risk is very small. Disease-induced tachycardia is more dangerous, such as coronary heart disease and myocardial infarction. Because tachycardia will trigger myocardial ischemia aggravation, and even the emergence of electrocardiographic instability, the performance of a variety of cardiac arrhythmia, and even sudden death, endangering the life of the patient.