There are many reasons that cause the stool is full of water, the common ones are: 1, gastrointestinal dysfunction caused by improper diet, indigestion resulting in diarrhea symptoms, such as eating unclean food, a large amount of too cold food, the body or abdomen cold will also appear in the case, at this time, we should pay special attention to the diet regulation, to light, easy to digest diet, avoid spicy, stimulating food, such as tobacco, alcohol, strong tea, coffee, etc., so as not to 2, acute gastroenteritis caused by bacterial or viral infections, often accompanied by nausea, vomiting, abdominal pain, diarrhea, can do routine blood, routine stool examination, the diagnosis is clear to give antibiotic treatment. 3, after eating a large number of laxatives can also appear stool is full of water symptoms, drinking water is not completely absorbed before being excreted out of the body, before doing colonoscopy will appear this symptom.