You should not donate blood the day after drinking alcohol. This is because after drinking alcohol, especially in large quantities, many people feel dizzy, lose appetite, nausea and other adverse reactions the next day. If you donate blood at this time, you may feel more tired and dizzy, and sometimes you may even experience panic and arrhythmia. After drinking alcohol, the liver has to metabolize the alcohol, which may cause a mild increase in transaminase concentration, and the blood donated may not be qualified after testing, resulting in a waste of blood products. At the same time, after drinking alcohol, the next day there may be an increase in blood lipids, and the quality of donated blood will be poor. Therefore, it is better not to donate blood the next day after drinking, even if you drink a small amount of alcohol. You should wait until you are in the best physical condition and after sufficient rest and nutrition before donating blood.