Blood froth discharged during stool may be caused by gastrointestinal bleeding, physiologic factors. 1. Upper gastrointestinal bleeding: Upper gastrointestinal bleeding refers to bleeding from the duodenum above the flexor ligament. Mostly due to peptic ulcer, acute gastric mucosal lesions, esophagogastric fundus varices or biliary pancreatic diseases. It is recommended that patients go to the hospital in time to improve gastroscopy, abdominal CT, blood tests and other tests to determine the cause of the disease. 2. Lower gastrointestinal bleeding: Lower gastrointestinal bleeding is mostly caused by hemorrhoids, anal fissure, rectal tumor, ulcerative colitis and other causes. It is recommended that patients improve enteroscopy, rectal diagnosis, stool routine and other tests to clarify the diagnosis. 3. Physiological factors: if the patient eats animal offal, blood products, dragon fruit is also very likely to appear in the case of blood foam in the stool. In this case, no special treatment is needed, stop eating these foods and pay attention to the color of the stool. It is recommended that patients go to a regular hospital to avoid delay in diagnosis and treatment.