Diarrhea after accidentally drinking pool water is not normal. Diarrhea after accidentally drinking water from the pool may be caused by bacterial infection, copper sulfate poisoning, or a cold abdomen. If the patient’s diarrhea symptoms worsen, and accompanied by high fever is recommended to seek medical attention. 1. Bacterial infection: the general swimming pool in the human body of harmful substances is very much, the patient mistakenly drink the water in the pool, is likely to lead to bacteria into the patient’s body, so that the stomach and intestines by the bacterial infection, resulting in patients with abdominal pain, diarrhea and other phenomena. Patients can take erythromycin capsules, amoxicillin and other drugs for treatment. 2. Copper Sulfate Poisoning: Pools are usually disinfected with copper sulfate, and patients who mistakenly drink pool water may cause copper sulfate poisoning, often accompanied by diarrhea, fever and other phenomena. If the patient’s condition is mild, he can drink a moderate amount of milk to relieve, if the condition is aggravated, it is recommended to go to the hospital immediately for gastric lavage. 3. Abdominal cold: abdominal cold is easy to make the patient gastrointestinal stimulation, which produces diarrhea phenomenon. Patients can take Montelukast and Bifidobacterium triplex as prescribed by the doctor under the condition of keeping warm. If the patient has uncomfortable symptoms, it is recommended to go to the hospital immediately, under the guidance of the doctor to take appropriate measures.