After eating stinky tofu stool is black, the causes are mainly divided into physiological and pathological two, can improve the relevant examination after symptomatic treatment. First, physiological: black stool after eating stinky tofu may be normal, if the patient in addition to eating stinky tofu, but also ate other dark-colored food, such as duck blood, pig blood, animal liver, etc., the pigment in the food is not absorbed, excreted with the food residue, there will be black stool, generally through the adjustment of dietary structure can be self-relieved, such as eating less colorful and irritating food, such as less food. Pay attention to dietary hygiene, avoid overeating, etc. Second, pathological: 1, upper gastrointestinal tract diseases: after eating stinky tofu may be an accidental situation, such as esophagitis, esophageal hiatus hernia, gastric ulcer, gastric mucosal prolapse, esophageal cancer and other diseases of patients eating stinky tofu happens to occur in the upper gastrointestinal bleeding, followed by black stool, this black is because of gastrointestinal bleeding, not because of eating stinky tofu. If this is accompanied by abdominal pain, acid reflux, belching and other symptoms, gastroscopy should be actively improved to identify and diagnose the type of disease, the application of drugs to enhance the protection of the gastric mucosa, such as omeprazole, cimetidine, famotidine, etc., as prescribed by the doctor to relieve symptoms, if necessary, surgical resection treatment; 2, other diseases: in addition to the upper gastrointestinal lesions, such as allergic purpura, hereditary hemorrhagic capillary dilatation, hemophilia , uremia, epidemic hemorrhagic fever, etc., if improperly fed, the stimulation of food may cause bleeding in the gastrointestinal tract and the appearance of black stools. At this time, patients often also have other system discomfort symptoms, if dizziness, anemia, skin rash, etc., should promptly go to the hospital, can improve blood routine, immunological examination, imaging, pathological examination for a clear diagnosis, for the cause of active treatment of the original disease, follow medical advice to stop bleeding, to avoid aggravation of the disease.