Cirrhosis of the liver black stool may be related to dietary factors, drug factors and other physiological causes, may also be related to gastrointestinal bleeding and other pathological causes. 1. Physiological causes (1) Dietary factors. If cirrhosis patients consume a lot of animal blood products, it can lead to black feces, which is a normal physiological phenomenon. (2) Drug factor. If cirrhosis patients iron sulfide and other iron drugs, bismuth potassium citrate capsules and other bismuth and other drugs can cause people to have black stools. 2. Pathologic causes. Cirrhosis can cause portal hypertension, esophagogastric fundus varices, and when eating hard food, it is easy to have gastrointestinal bleeding, resulting in black stool. When you have cirrhosis with black stools, you should consult a doctor in time to detect the cause through fecal routine in order to treat it actively.