What is the reason for the black thing in the stool?

If there is something black in the stool, on the one hand, it may be indigestible food. On the other hand, it may be intestinal mucosa shedding. Specifically, it should be clear in combination with the patient's current symptoms. If the patient has obvious intestinal symptoms such as intestinal infection or indigestion at this stage, then this situation is more likely to be indigestible food. However, if the patient has no special discomfort at this stage, he only occasionally shows black things in his stool, which is considered to be substances formed after intestinal mucosa metabolism falls off. Specific recommendations or to be able to take typical stool samples for routine examination of a clear diagnosis.