Drinking wine after the black stool may be due to the color of wine will stool staining caused by the normal phenomenon, there may also be due to drinking alcohol caused by upper gastrointestinal bleeding, there may be due to drinking wine at the same time in the supplementation of iron caused. 1. Physiological factors: after drinking wine, if the pigment in the wine stains the feces, the color of the stool can be blackened, which is a normal phenomenon, no need to worry too much, usually after 1~2 days, the color of the stool can be restored to normal by itself. 2. Upper gastrointestinal bleeding: drinking a lot of alcohol can induce or aggravate gastritis, gastric ulcer and other diseases, leading to upper gastrointestinal bleeding, which leads to the symptom of black stools, and the patient may also have epigastric pain, nausea, vomiting and other symptoms. 3. Supplementary iron: If you drink wine while also taking iron supplements such as ferrous succinate, then iron metabolism in the intestinal tract will produce black trivalent iron ions, which in turn will cause the symptoms of black stools, which is a normal phenomenon caused by the supplementation of iron supplements. After eliminating the physiological factors, if the symptoms of black stools continue to be unrelieved, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.