Black spots in the stool may be caused by food factors, which is normal; it may also be caused by bacterial enteritis, gastrointestinal bleeding and so on, which is abnormal. 1. Food factors: If you have recently consumed a lot of black food, such as black sesame seeds, it may lead to the appearance of a large number of black food residues, causing black spots. 2. Bacterial enteritis: it can cause damage to the mucous membrane of the gastrointestinal tract, for example, causing intestinal oozing or bleeding, and once the bleeding is relatively large, it will cause black stools. 3. Gastrointestinal bleeding: especially upper gastrointestinal bleeding, such as the esophagus, stomach and duodenum and other gastrointestinal lesions, will cause bleeding, causing black stools, which is the main clinical symptoms of gastrointestinal bleeding. It is recommended that patients first need to rule out food factors, and then need to actively go to the regular hospital to receive examination and treatment, so as not to delay the condition.