Light yellow and whitish stool color may be caused by indigestion and may also be associated with liver, gallbladder and pancreatic disorders. Fat malabsorption can lead to a pale yellow, whitish stool color. A positive fecal fat test may indicate a problem with fat absorption. If the stool is light yellow or whitish in color due to this condition, the symptoms can be improved by taking medicines to promote digestion, such as digestive enzymes, or by eating less fat-rich food in general. If the color of stool becomes light and shows clay-like changes, it may be caused by liver, gallbladder and pancreatic diseases, such as blockage of bile ducts due to various reasons, including bile duct stones, bile duct cancer, pancreatic head cancer, etc., which need to be identified by ultrasound, CT and MRI of the upper abdomen, as well as laboratory tests, such as routine blood tests and alpha-fetoprotein measurement. If the above symptoms occur, it is recommended to go to the hospital in time to identify the cause and deal with it in time.