Sinus tachycardia is depicted on an electrocardiogram as sinus tachycardia. Sinus tachycardia is a heart pacing rate of greater than 100 beats per minute from the sinus node. Sinus tachycardia is a common cardiac arrhythmia. Its clinical significance needs to be judged in conjunction with the clinical, can be caused by non-disease factors, such as nervousness, emotional excitement, strenuous exercise, drinking alcohol, strong tea, coffee, etc. can appear, without treatment. Disease factors are common in hyperthyroidism, fever, anemia, pain, low blood pressure, etc. Taking certain drugs such as anticholinergic drugs can also cause tachycardia. It needs to be analyzed in combination with other clinical indicators. Generally there is no obvious discomfort in mild cases, chest tightness, palpitations, dyspnea may occur when the heart rate is too fast, and fainting may occur in severe cases. If sinus tachycardia is found, further 24-hour dynamic electrocardiogram can be done to evaluate the 24-hour heart rate. If there is no relief after removing the causative factor, further examination and treatment in a cardiovascular specialist is recommended.