The first factor that causes sudden watery stools is gastrointestinal dysfunction. It is recommended to take oral probiotics to regulate intestinal flora, pay attention to abdominal warming measures and avoid colds. Eat more easily digestible food and less cold and stimulating food. In addition, consider that it may be caused by a cold or viral infection, it is recommended to take oral montelukast treatment and apply a piece of belly button patch externally. If it does not improve, it is recommended to go to the hospital to check the stool routine to determine the cause. Pay attention to timely hydration, drink some saline water or eat hot soup food, such as noodle soup, wonton soup, egg soup, etc. Replenish the body with water in a timely manner to prevent dehydration. It is usually important to keep warm and avoid being exposed to wind, rain and cold. If the symptoms of infection are obvious, treatment such as anti-infection, rehydration and maintenance of water-electrolyte balance can be considered. If this approach does not improve for more than a week, further investigations should be performed.