Cold stomach and intestine and bacterial infection in the pool are the main causes of diarrhea after swimming. First, the water temperature in swimming pools is generally lower than the human body temperature, and human contact with water in swimming pools makes the abdomen cold, leading to digestive disorders causing diarrhea. Secondly, the bacteria of diarrhea may exist in the swimming pool, even if the pool water disinfection may still kill all the pathogens, once choking or swallowing water when swimming, the bacteria in the pool will enter the human body, plus the patient’s own immune system is low will appear diarrhea. Patients with diarrhea after swimming can take antidiarrheal medication, such as enteritis pellets for regulation to eliminate inflammation and slow down diarrhea, and also with patchouli capsules to stop diarrhea. In daily life, pay attention to eating soft, easy-to-digest food, eat hot food, try not to eat large, raw and cold food, you can apply local heat to the abdomen to relieve symptoms, if the diarrhea is serious, immediately go to the hospital for examination, and at the same time, rehydration and conditioning.