White clay stools are mostly the result of obstruction caused by the hepatobiliary ducts. Because the stool itself is yellow, most of it will have bilirubin or fecal bilogen, and this element is mostly the color caused by bile secreted by the liver that is excreted into the duodenum and enters the intestine. If the bile duct is obstructed, such as obstruction caused by pancreatic cancer pressing on the bile duct, or bile duct stones, intrahepatic bile duct or common bile duct stones, etc., which cause the common bile duct to drain bile poorly and cause bile to enter the intestine and further into the blood, resulting in white clay-like stools without bilirubin. This condition is usually accompanied by scleral yellowing, skin yellowing, liver function damage, etc. It is necessary to actively give ultrasound examination, liver function test, and if necessary, improve liver magnetic resonance examination to further confirm the diagnosis.