Whether sinus tachycardia causes sudden death needs to be analyzed according to the precipitating cause and cannot be generalized. Sinus tachycardia is an increased heart rate of 101-160 beats per minute, and is a common arrhythmia problem. If simple sinus tachycardia occurs due to strenuous exercise or fever, stress, excitement, excessive sadness, etc., it is caused by sympathetic overexcitation and usually does not pose a risk of sudden death, and can be relieved by paying attention to rest and calming down. If it is triggered by hyperthyroidism, anemia, coronary heart disease or heart valve disease, it is often accompanied by other symptoms, such as shortness of breath and pain in the precordial area, which may pose a risk of sudden death and should be treated for the cause. If you feel that your heart rate is abnormal, it is recommended to go to the cardiology department for medical examination in time to avoid delaying your condition. Avoid stimulating food in daily diet, especially for those who prefer smoking, alcohol and coffee, they need to change their habits.