Watery stools are caused by acute enteritis, rotavirus infection, and dysentery. During an attack of acute enteritis, violent diarrhea occurs because the intestinal mucosa is inflamed, so function is impaired and peristalsis is hyperactive. When the contents of the patient’s intestines are completely expelled, the fluid exuded from the intestines is expelled from the body because there are no longer any food residues present, and the stools are then mainly watery. When rotavirus infects the intestinal tract, it also causes severe diarrhea. In the early stages, the patient excretes food residue, but when the food residue is removed, the stool is mainly watery. Dysentery is a disease caused by bacterial infection and is characterized by bloating, diarrhea, and fever. If dysentery is not treated in time, not only will the intestinal mucosa be damaged, but also the water will not be absorbed by the body, and the intestine will secrete a lot of water and excrete it with intestinal peristalsis, so the feces will be watery.