Massive secretion of intestinal fluid may be caused by diseases such as enteritis, schistosomiasis, and intestinal cancer. 1. Enteritis: Enteritis is a common disease in the digestive system. It may be caused by unclean diet and systemic infectious diseases. Symptoms such as abdominal pain, diarrhea, fever, and large secretion of intestinal fluid may occur. 2. Schistosomiasis: Schistosomiasis is a disease caused by parasitic schistosome infection. Symptoms such as fever, lower abdominal pain, diarrhea, dry cough, splenomegaly, malaise and large amount of intestinal fluid secretion may occur. 3. Intestinal cancer: Intestinal cancer is a kind of common malignant tumor of digestive tract in China. It may be caused by ageing, heredity, diet, gastrointestinal diseases and so on. There may be symptoms such as abdominal pain, abdominal mass, anemia, weight loss, change of bowel habit, and large amount of intestinal fluid secretion. Inflammatory bowel disease such as Crohn’s disease or gastrointestinal tract dysfunction may also lead to the secretion of large amounts of intestinal fluid, which will be obvious mucus stools, it is recommended to go to the hospital in time to determine the cause of the disease. Treatment under the guidance of a specialized doctor.