Women with black stool may be related to the type and color of food intake recently, or it may be caused by gastrointestinal bleeding, which requires prompt consultation with the gastroenterology department to determine the nature of the black stool and treat it symptomatically after clarifying the cause. 1, diet-related: large consumption of animal blood products such as duck blood, pig blood, or dark foods such as seaweed, nori, purple potatoes, or taking iron supplements recently may make the stool darker and closer to black. Usually, after resuming a normal diet, the color of the stool will also return to normal. If the color is still dark after a period of time, further examination is required to determine whether there is gastrointestinal bleeding; 2. Gastrointestinal bleeding: mainly caused by gastrointestinal bleeding, such as gastric ulcer, duodenal ulcer, acute erosive gastritis, gastric cancer and other diseases may lead to gastrointestinal bleeding, causing black stool, and in severe cases, accompanied by abdominal pain, vomiting, vomiting blood In addition, certain serious liver diseases, such as cirrhosis, can also cause gastrointestinal bleeding, which requires timely consultation with the relevant departments for routine blood, gastroscopy, routine stool, ultrasound and other related examinations to clarify the cause and then treatment.