Bile is a digestive fluid that emulsifies fat, but does not contain digestive enzymes. Bile-free stools are stools that do not contain bile or bile pigments. α1 antitrypsin deficiency liver disease occurs in newborns with hereditary α1 antitrypsin deficiency within the first month of life with cholestatic jaundice, slow weight gain, lethargy, irritability, and bile-free stools. The following symptoms need to be distinguished: 1. Obstructed bile excretion: Once a tumor or stone occurs in the extrahepatic biliary system, the bile duct is blocked and bile cannot be excreted smoothly, and obstructive jaundice occurs. When the biliary system is obstructed, the excretion of bile is hindered and the bilirubin returns to the bloodstream causing jaundice, called obstructive jaundice. The site of obstruction may be intrahepatic or extrahepatic, and there are complete and incomplete obstructions. Common causes include capillary bile duct hepatitis, gallstone disease, hepatocellular carcinoma, bile duct cancer, pancreatic cancer, biliary ascariasis, etc. 2, fecal pus and blood: feces mixed with pus and blood. Dysentery bacillus infection. In the epidemic season there is a history of dysentery contact or a history of unclean diet, fever, mucous pus and blood stool, shortness of breath and other symptoms. 3, malignant breath, multi-bubble smell of white stool: Patients with fecal nematode disease can excrete malignant breath, multi-bubble smell of white stool, and even severe steatorrhea. Fecal nematode disease is a parthenogenetic parasite with alternating generations, its autochthonous generation is carried out on the ground soil, and the parasitic generation is carried out in the human body. The life history is more complex and the pathogenesis is long.