Frothy stools in adults are associated with indigestion, lactose intolerance and enteritis. 1. Indigestion: When adults have stomach dysfunction and decreased diastolic function of the stomach to food tolerance, it may cause indigestion, which is manifested as foamy stools. Some patients are also prone to abdominal pain, postprandial fullness, early satiety and other discomforts. 2. Lactose intolerance: Lactose intolerance is related to congenital lactase deficiency, inflammatory bowel disease and surgery. Typical symptoms of patients include abdominal distension, hyperactive bowel sounds, diarrhea, nausea and vomiting, etc. Some of the patients also have yellow loose stool or egg pattern, foam and acidic odor during defecation. 3. Enteritis: enteritis is related to pathogenic microbial infection, abnormal immune mechanism, intestinal ischemia. Some patients with enteritis may have foamy stools due to intestinal flora imbalance, and they are also prone to abdominal pain, bloody stools, nausea and vomiting, fever and other symptoms. Adults with foaming stools are advised to consult a doctor for prompt examination so that the cause of the problem can be identified and treated. Pay attention to the rationality of diet, keep the abdomen warm, and drink more water.