Diarrhea, foamy consider the following causes: First, intestinal infections, such as viral enteritis, bacterial dysentery, patients with rapid intestinal peristalsis, unformed stool, but more gas production, easy to appear foamy stool. Second, irritable bowel syndrome, intestinal dysfunction can also cause increased intestinal peristalsis, diarrhea. Third, improper diet, eating too much cold and spicy stimulating food, will also appear exhaust and defecation abnormalities. Fourth, be alert to suffer from chronic pancreatitis, when the exocrine function of the pancreas is lost more than 90%, there will be pancreatic exocrine insufficiency, resulting in the secretion of pancreatic enzymes after meals is difficult to maintain normal food digestion, manifested as emaciation, bloating after meals, loss of appetite, fat digestion and malabsorption, and even fatty diarrhea, stool discharge more often, feces with foul odor, foamy floating on the surface, microscopic examination can be seen fat droplets and muscle fibers. If left untreated, it can lead to lower levels of circulating fat-soluble vitamins, rough skin, night blindness, and bleeding tendencies. When there is a change in the nature of the stool, it is important to go to the hospital for relevant examinations and give comprehensive treatment to avoid delaying the disease.