Foamy stool refers to the formation of foam in the stool, which may be related to the following factors: first, poor digestive function; second, cold in the gastrointestinal tract; third, the imbalance of intestinal flora or the result of eating an inappropriate diet. If there are simple foamy stools without pus and blood mucus, fever, nausea and vomiting, on the one hand, it may be due to eating a large amount of cold food at the time of eating, or the digestive dysfunction after getting cold, which can lead to the foamy stools. There is also the recent period, the patient may not digest well or eat more greasy food, resulting in weakening of the digestive function, can also produce foamy stools. When the intestinal flora is out of balance, probiotics decrease and harmful bacteria increase, stools will also be foamy, and the smell of defecation will be foul. However, if the patient has foamy stools and fever, nausea, vomiting, etc., it may be related to acute gastroenteritis caused by improper eating. If the symptoms worsen with blood in the stool, it is recommended that the patient should go to the hospital to have stool tests performed by the doctor, and if necessary, enteroscopy to further clarify the diagnosis.