Although the fungus is black, after digestion, the fecal discharge may be the food residue of black fungus, that is, the feces may be mixed with black spots or other black food-like things. If the stool is pure black, that is, black in general, it is not caused by food, but by the presence of upper gastrointestinal bleeding. Patients need to pay attention to the identification, and if necessary, they need to go to the hospital and cooperate with the doctor to give the examination, stool routine plus occult blood test to determine whether there is a situation of gastrointestinal bleeding. If the black stool is caused by food, it is normal and does not require treatment. If it is confirmed that there is gastrointestinal bleeding, you need to actively cooperate with the doctor to give treatment.