Black stools after drinking alcohol alert stomach bleeding and other diseases. After drinking a lot of alcohol, alcohol will lead to gastric mucous membrane damage bleeding, such as previously suffered from gastric ulcer and other peptic ulcerative diseases, the probability of gastric hemorrhage is higher. After gastric bleeding, the blood will follow the digestive tract from the pylorus into the intestines and undergo a chemical reaction with the digestive juices, transforming the iron in the blood into black iron sulfide, which mixes with the feces and turns the feces black. Therefore, when you find black stools after drinking alcohol, you need to be wary of stomach bleeding and other diseases, you can go to the hospital for fecal occult blood test, such as positive, it means that there is blood in the stools, but it should be noted that if you drink alcohol and consume animal blood products, such as pig’s blood, duck’s blood and so on, you may also be black, and does not belong to the disease. There may be other diseases that cause black stools after drinking alcohol, so you can go to the hospital for a checkup to clarify the situation.