Whether black stools in diarrhea are serious or not needs to be judged according to the cause. If the deepening of the color of the stool caused by dietary factors is not serious, such as the black stool caused by gastrointestinal bleeding, more serious, need to clarify the cause of the disease and symptomatic treatment. The cause of black stool may be physiological or pathological. In the former case, if you eat dark-colored food, such as mulberries, etc., black stools may appear, and no special treatment is needed at this time, and black stools will not appear again after the dark-colored food is excreted. The latter may be caused by gastrointestinal diseases or medications such as aspirin enteric-coated tablets, etc. It is recommended to go to the hospital in a timely manner to determine the cause of the problem so as not to delay treatment.