Usually when patients drink alcohol, the heart feels that it is beating especially fast because of the following reasons: 1. The capillaries will expand rapidly when drinking alcohol, because the ethanol in alcohol will be decomposed into acetaldehyde under the action of liver ethanol dehydrogenase, acetaldehyde is a harmful substance that can make the capillaries dilate rapidly. In the case of capillary dilation, it will reflexively cause tachycardia, when the amount of return blood will increase and fill up overnight, then there will be a series of symptoms and clinical manifestations such as palpitations, chest tightness, shortness of breath, panic, etc. 2, after drinking alcohol, there will be sympathetic hyperexcitation, and when the sympathetic nerves are overexcited, there will also be a transient increase in blood pressure, a sudden increase in heart rate, palpitations, tachycardia, etc, Tachycardia and other conditions may occur.