Bad liver affects the secretion of bile, excretion of bilirubin, synthesis of coagulation factors, etc., which may cause unformed stools, light-colored stools, dark-colored stools, and so on. Decrease in liver function caused by alcohol consumption and virus infection will affect the secretion of bile. Eating greasy food, etc., and the fat cannot be fully digested and absorbed, which will easily cause unshaped stools and an increase in the frequency of stools. If the liver is not good, if there is a disorder of bilirubin excretion, with increased bilirubin in the blood and lack of bilirubin in the excretions, the feces may show a potter’s earth color. In case of cirrhosis and other decrease in liver function, which leads to decrease in coagulation factors, and in case of peptic ulcers and other causes of gastrointestinal bleeding, blood undergoes a chemical reaction in the intestinal tract, and the feces appear black after defecation. Patients with bad liver should pay more attention to the color and traits of stool, etc. If there are abnormalities, excluding physiological factors such as eating, they should consult a doctor in time.