Eating greasy diarrhea consider may be indigestion, irritable bowel syndrome, cholecystitis and other causes. 1. Indigestion: greasy food is often easy to cause indigestion, gastrointestinal peristalsis is slow, food in the gastrointestinal tract can not be digested and absorbed in a timely manner, it will be discharged with the stool, resulting in symptoms of diarrhea. 2. Irritable bowel syndrome: the patient’s gastrointestinal function itself is affected, after eating greasy food, it will cause some stimulation of the intestinal tract, resulting in faster intestinal peristalsis, thus causing diarrhea. 3. cholecystitis: due to the existence of inflammation of the gallbladder, will lead to the gallbladder duct is blocked, can not be normal excretion of bile, intestinal lack of bile decomposition, fat intake, greasy food is easy to cause diarrhea, and often also nausea, loss of appetite and other symptoms. Eating greasy diarrhea may also be caused by other reasons, such as chronic gastroenteritis, chronic hepatitis, etc. It is recommended to go to the hospital in time to find out the cause of the targeted treatment.