Diarrhea and froth may be related to unhygienic diet, cold abdomen and indigestion. 1. Unhygienic diet: If the patient eats too much unclean food and includes starchy and sugary food, the food will ferment in the intestines and foam will be produced under the decomposition of E. coli. 2. Abdominal cold: If diarrhea is caused by abdominal cold, gastrointestinal cramps and other problems may occur, resulting in diarrhea with foam. 3. Indigestion: if the patient has diarrhea with foam in the feces, it may be caused by indigestion, the food can not be completely absorbed, it will generate gas under the action of intestinal bacilli, and the gas in turn stimulates the intestinal wall to accelerate peristalsis, so the discharged feces will be with foam. There are many other causes of diarrhea and foam, it is recommended to go to the regular hospital in time, after clarifying the cause of the disease, under the guidance of the doctor for targeted treatment.