The fermented flavor of stool may be related to indigestion, intestinal dysbiosis, gastroenteritis and other factors. 1. Indigestion: Indigestion is caused by insufficient intestinal power, which leads to the accumulation of feces in the intestines for a long time, resulting in abnormal fermentation and the appearance of a fermented smell in the stool. 2. Intestinal dysbiosis: if the patient has intestinal microecological imbalance due to the abuse of antibiotics (e.g. cephalosporin), due to dysbiosis, the feces may not be able to ferment normally in the intestinal tract, and there will be the phenomenon that the feces have a fermented smell. 3. Gastroenteritis: During the period of illness, gastrointestinal dysfunction affects the digestion and absorption of food and the feces can not be discharged in a timely manner, which may lead to the smell of fermentation in the stool. It is recommended to go to the regular hospital in time for the person with a fermented taste in the stool, to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.