The etiology of premature beats is relatively broad, the exact mechanism is still unclear, it is currently believed that it may be related to a variety of pathological, physiological changes or external factors. 1. Pathological and physiological changes: emotional excitement, nervous tension, fatigue, indigestion, excessive smoking, drinking alcohol or strong tea may lead to premature beats; abnormalities in the structure and function of the heart are common causes of premature beats, such as heart failure, coronary heart disease, valvular heart disease, myocarditis, hypertensive heart disease, and pulmonary heart disease. 2. External factors: the side effects of certain drugs, such as digitalis, quinidine, tricyclic antidepressants, cyclopropane anesthetics, etc., may lead to premature beats, and the lack of potassium in the body may also appear premature beats symptoms. When the symptoms of premature beats significantly affect the blood pumping function of the heart, the symptoms of chest tightness, fatigue, dizziness, and even induce angina pectoris, it is recommended to seek medical treatment in time.