Eating stinky tofu black stool is usually normal, but do not rule out the phenomenon of upper gastrointestinal bleeding. The marinade in which stinky tofu is soaked is rich in pigments, which cannot be absorbed by the body and will be excreted together with the food residues, so black stools may occur. If this happens, the diet structure can be adjusted, generally not intake of stinky tofu will return to normal. If the patient suffers from esophagitis, gastric ulcer, gastric mucosal prolapse, esophageal cancer and other diseases, which may be accompanied by upper gastrointestinal bleeding, and happens to eat stinky tofu, black feces will occur, which is not normal, is a pathological change, and needs to draw the patient’s attention. If the patient has black feces, accompanied by abdominal pain and other discomforts, it is necessary to go to the hospital in a timely manner to find out the cause of the disease and then carry out the appropriate treatment.