Swimming diarrhea may be the gastrointestinal tract is cold leading to abdominal muscle spasms, or more bacteria in the pool, swallowed into the mouth leading to infection, and then diarrhea, which is the main cause of diarrhea after swimming. 1. Gastrointestinal tract is cooled: because the water temperature in the swimming pool is generally lower, easy to stimulate the abdominal muscles, resulting in gastrointestinal tract is cooled, abdominal muscle spasms, stimulation to the intestinal tract leading to digestive disorders are easy to cause abdominal pain, diarrhea. 2. Bacterial infection: due to more people in the pool, if disinfection is not timely, easy to cause bacterial growth, such as Escherichia coli and other bacteria are more likely to reproduce in the swimming pool, if you accidentally drink the pool water at the same time the patient’s immune system is low, it will lead to abdominal pain, diarrhea and other symptoms. Diarrhea after swimming may also be caused by other reasons, it is recommended that patients go to the hospital as soon as possible to find out the cause of the disease after targeted treatment, so as not to delay the condition.