Fatty diarrhea is not always due to fat loss, but needs to be analyzed on a case-by-case basis, as follows: 1, fat loss: probably patients who take oral lipase inhibitors, the fat in food cannot be decomposed and absorbed, and is excreted from the intestines in the form of fat, such cases can be fat loss. 2, organic lesions: there can also be fatty diarrhea, such as indigestion, small intestine, colon, rectal lesions, and intestinal mucosa Damage, poor intestinal digestion and absorption, patients are also prone to steatorrhea. 3, after removal of the gallbladder: because there is no gallbladder to store bile, when after eating high oil food, there is not enough bile to digest food, also prone to steatorrhea. The presence of fat in the stool indicates that the patient’s gastrointestinal function is disturbed, and the phenomenon of farting with oil or with oily flowers will occur. In this case, patients are advised to eat light, warm, soft and easily digestible food and to undergo gastroscopy if necessary.