When pulling black stool, first need to check the blood routine fecal occult blood test, such as positive, suggesting the possible existence of gastrointestinal bleeding, can follow the doctor’s instructions for further gastroscopy, colonoscopy, routine blood tests, and so on. Normal stool color is yellow or brown. When black stools occur, you need to rule out the effects of food and medication first. For example, after eating more animal offal and animal blood recently, the stool can appear black. Certain medications can also cause black stools, such as those containing bismuth and iron. In the absence of a clear dietary and medication history as described above, black stools are considered to be associated with gastrointestinal bleeding. Gastrointestinal diseases, such as peptic ulcer, acute erosive hemorrhagic gastritis, and gastrointestinal tumors, can cause gastrointestinal bleeding, which can be followed by vomiting of blood, black stools, anemia, and other symptoms. When the bleeding is large, it can directly lead to hemorrhagic shock. Therefore, when you have black stool, you need to perform fecal occult blood test first, and if it is positive, you should further perform gastroscopy, colonoscopy, routine blood test, etc., in order to clarify the specific cause and location of the gastrointestinal bleeding, and whether there is any anemia at present, etc., and actively treat it.