What about black shit?

Black stools are abnormal stools and are more common clinically. After excluding animal blood and other foods and drugs that may cause black stools, it is necessary to consider the possibility of upper gastrointestinal bleeding. Specific symptoms include peptic ulcer, i.e. gastric ulcer and duodenal ulcer with bleeding, liver cirrhosis with varicose veins in the lower esophagus and bleeding, biliary tract bleeding, and small intestine bleeding, especially in the proximal jejunum. Black stools should be examined accordingly, including blood routine, stool routine and occult blood test, digestive system color Doppler ultrasound and gastroscopy to determine the detailed site of bleeding, so as to take targeted treatment measures.