The oil in the stool is mainly caused by the following three reasons: 1, dietary factors, the usual intake of a large number of too greasy food, especially high fat and high-calorie food, it is difficult to be absorbed and decomposed by the digestive system, stool with a large number of greasy substances. 2, indigestion and gastrointestinal disorders, a variety of internal and external factors can lead to the occurrence of indigestion symptoms, indigestion makes a large number of food can not be properly decomposed and absorbed, especially greasy food, food will quickly decline with the intestinal tract and eventually mixed with the stool.