What is the reason why stool is a little black

Stool a little black, can be understood as black stool, the cause of black stool, can be seen in the diet situation, if the food eaten is animal blood and meat, or spinach, etc., can make stool appear black, in addition, eat some drugs, such as iron and bismuth pectin, etc., will also make stool appear black. Stool blackening is also seen in upper gastrointestinal bleeding, because after the blood reacts with gastric acid in the stomach, it will appear as black stool, which can be tar-like, called tar-like black stool, so the patient is recommended to go to the hospital for treatment, need to check stool routine plus occult blood, if occult blood is positive, it indicates the existence of upper gastrointestinal bleeding, need to go to the digestive department to see a doctor to systematically find the cause of gastrointestinal bleeding, and select treatment measures.