If the girl swimming in an unclean environment, there is a history of contact with infected water may appear sudden diarrhea, considering that it may be viral enteritis, amoebic enteropathy, cholera and other infectious diseases, need to take medication, surgical treatment for the cause of the cause of the disease, general measures for the treatment of the way. 1. Viral enteritis: common symptoms include acute diarrhea, abdominal pain, nausea and so on. Some patients need to apply montelukast on medical advice, which can effectively eliminate pathogenic bacteria and relieve diarrhea, and if it has caused mild dehydration, oral rehydration salts should be taken on medical advice. Usually mild symptoms can be self-cured, need to pay attention to bed rest. 2. Amebic enteropathy: the main symptoms are abdominal pain, diarrhea and other digestive discomfort. Patients need to follow the medical advice to apply nitroimidazole drugs such as metronidazole and tinidazole. If there is also a bacterial infection, you need to follow the doctor’s instructions to apply amoxicillin, cefuroxime and other antibiotic drugs. For patients with vaginal fistula or perianal fistula, hanging thread therapy or fistulotomy is required. Patients also need bed rest, appropriate rehydration, strengthen the intake of nutrients. 3. Cholera: the typical symptoms are vomiting, diarrhea and so on. Patients need to follow the doctor’s instructions to apply chlorpromazine, Flavopiridol and other antidiarrheal drugs, as well as intestinal mucosal protective agents, such as colloidal bismuth pectin, bismuth potassium citrate and so on. Antibiotics such as ciprofloxacin and levofloxacin should also be applied as prescribed. The patient needs to be isolated, and the relevant excreta need to be thoroughly sterilized. When a girl suddenly has diarrhea while swimming, she needs to go to the hospital in time and cooperate with the doctor to actively treat the original disease.