Normal human heart rate is 60 to 100 beats per minute, more than 100 beats is called tachycardia. Mild tachycardia can have no obvious discomfort, but in severe cases, patients will experience palpitations, chest tightness, dizziness, shortness of breath and other symptoms, and may even suffer from shock, confusion and life-threatening conditions due to insufficient blood supply to the heart because of the rapid heart rate. Tachycardia can be categorized into physiological and pathological tachycardia. Physiological tachycardia is often caused by emotional excitement, nervousness, anxiety, or after strenuous exercise, which can be relieved on its own. Pathological tachycardia is caused by heart rate acceleration due to heart or other organ and systemic diseases, such as cardiomyopathy, heart failure, hyperthyroidism, fever, electrolyte disorders, etc., and requires therapeutic interventions to return to normal. Patients are advised to seek prompt medical attention if they feel unwell, and not to be negligent so as not to delay or aggravate their condition.