After drinking red wine the next day the stool is black, and the intake of food, some people should be alert to the gastric perforation, gastric fundic vein bleeding and other diseases, as follows: 1, many people in drinking red wine, will be a large intake of some animal blood, animal liver food, because this type of food contains a lot of iron, after entering the digestive system, will be oxidized to ferrous sulfate. Excretion of feces because of a large number of ferrous sulfate, so it will appear black, but this will not be accompanied by abdominal distension, abdominal pain and other symptoms; 2, when the next day after drinking red wine excretion of black stool, accompanied by abdominal discomfort, should be alert to gastrointestinal bleeding disease, red wine contains a certain amount of ethanol, which is a stimulating substance, once the stomach ulcer disease, after drinking a lot of alcohol Even lead to gastric perforation, gastric perforation will exist in the stomach bleeding phenomenon, thus leading to black stool; 3, people with cirrhosis of the liver because liver function has been damaged, so should try to avoid drinking, once the cirrhotic people drink, will lead to excessive expansion of the portal vein, and even induce bleeding in the gastric fundic vein, will also lead to black stool symptoms.