It is normal for stools to turn black after drinking wine, but we cannot completely rule out pathological factors such as upper gastrointestinal bleeding and other causes of black stools. Wine is a kind of drink made from grapes, which contains many pigment components of grapes, and the pigment components of grapes are mainly purple and black, so after drinking wine, the pigment is discharged with the feces, which may lead to black feces. At the same time, red wine contains iron, which is deposited in the intestines and discharged with the feces, and can also cause the feces to turn black. Although drinking wine may cause non-pathological factors of black stool, but we can not completely exclude the possibility of the existence of pathological changes, due to the alcoholic beverages will stimulate the gastrointestinal tract, if you are suffering from gastritis or gastric ulcer and other diseases, drinking wine may stimulate the gastric mucous membrane to cause gastric mucous membrane bleeding, which leads to black stool. If there are other uncomfortable symptoms or if the black stools persist for several days, it is important to go to the hospital and find out the specific cause for treatment.