Under normal circumstances, the heart will beat very fast after drinking alcohol because a large amount of alcohol will stimulate the human nervous system, resulting in increased excitability of the sympathetic nerve. When the sympathetic nerve is overexcited, the patient will have a faster heartbeat, increased myocardial contraction, increased conduction speed of the heart, and increased oxygen consumption of the heart, and then the patient will have clinical symptoms and reactions of tachycardia. In addition, after drinking large amounts of alcohol, the ethanol in alcohol will be converted into acetaldehyde, which is a toxic and harmful substance that can rapidly open capillaries, thus further aggravating the clinical symptoms of tachycardia. For patients with previous coronary artery disease or angina pectoris, the symptoms of tachycardia are especially obvious after drinking alcohol. Once such patients have chest tightness and shortness of breath, especially in the clinical symptoms of chest pain, they must quickly arrive at the hospital for relative treatment.