Water is metabolized primarily in the kidneys, and drinking too much water does not usually cause diarrhea. After water enters the body, it is mainly metabolized through the kidneys and excreted through urine or skin volatilization. Usually drink more water will lead to an increase in urine, and will not cause diarrhea. But if the water quality is unqualified, the water temperature is too cold or suffer from gastrointestinal diseases, may also appear to drink too much water dilution. 1. Unqualified water: If the water you drink is contaminated by bacteria, viruses and other pathogenic microorganisms, it may cause acute gastroenteritis after a large amount of drinking, causing patients to experience abdominal pain and diarrhea, nausea and vomiting and other symptoms, leading to diarrhea. 2. Water temperature: If the temperature of the drinking water is too cold, a large number of drinking will produce stimulation of the gastrointestinal tract, so that the gastrointestinal peristalsis accelerated, which may also lead to the water to drink more diarrhea. 3. Gastrointestinal diseases: If the patient himself suffers from gastroenteritis, inflammatory bowel disease, peptic ulcer, irritable bowel syndrome and other basic gastrointestinal diseases, after drinking a large amount of water, it may produce stimulation of the gastrointestinal tract, so that the patient has diarrhea. If the patient has a long-term or repeated presence of water drinking too much diarrhea, it is recommended to seek timely medical attention to identify the cause of the disease, targeted treatment, so as not to delay the condition.