For patients with heart disease, beer is not allowed. Usually beer contains ethanol, which is decomposed into acetaldehyde by the action of liver ethanol dehydrogenase, a toxic and harmful substance that opens capillaries and short-circuits arterioles and veins, and opens direct pathways, so that patients may suffer from a severe lack of cardiac perfusion, for example, which can lead to arrhythmias. In addition, it can also cause severe myocardial ischemia and hypoxia, which can increase the cardiovascular burden for patients with heart disease, and also induce arrhythmias, which can lead to coronary atherosclerotic heart disease, unstable angina, and even myocardial infarction, so it is not recommended for patients with heart disease to drink beer.