ECG is the abbreviation of electrocardiogram, there is no normal value, there is a normal value is the heart rate, 60-100 beats/min, more than 100 beats/min is tachycardia, less than 60 beats/min is bradycardia, tachycardia can be divided into physiological and pathologic causes. Physiological reasons include after exercise, drinking a lot of alcohol, smoking or physical labor, the heart rate is accelerated is a normal phenomenon. Pathological factors include anemia, hyperthyroidism, heart failure, etc. Tachycardia is not a specific symptom, and it needs to be identified through accompanying symptoms or relevant examinations. Anemia caused by increased heart rate, check the blood routine can be diagnosed. In addition to increased heart rate, hyperthyroidism is characterized by panic attacks, sweating, and protruding eyes. Heart failure is a serious stage of various heart diseases, which is accompanied by dyspnea or lower limb edema in addition to rapid heart rate.