Monthly maternal black stool, if related to diet or medication, can be adjusted accordingly; if related to upper gastrointestinal bleeding, should be promptly treated. 1. Diet or medication: If the mother eats animal liver, pig’s blood and other foods, or oral iron supplementation drugs, such as ferrous sulfate, etc., it is likely to have black stools. This situation is generally discontinued or the corresponding dietary adjustments, can return to normal. 2. Upper gastrointestinal bleeding: black stools may be associated with upper gastrointestinal bleeding, common diseases such as gastric or duodenal ulcer. At this time, it is recommended to timely consult a gastroscopy to identify the specific causes, if the diagnosis of upper gastrointestinal bleeding, under the guidance of the doctor to use acid-suppressing drugs, gastrointestinal mucosal protection or hemostatic drugs for treatment, and if necessary, you can also consider surgical treatment. As you can see, if the mother’s black stools are not relieved after dietary adjustments or discontinuation of medication, or if other uncomfortable symptoms occur, you should seek medical attention to identify the cause, and treatment under the guidance of a doctor.