If you have diarrhea for 3 days and take medication without any effect, it is advisable to go to the hospital immediately to see if it is caused by bacterial infectious enteritis or rotavirus infectious enteritis. It is recommended to check the blood, stool, electrolytes, liver and kidney functions, etc. to clarify the severity and nature of the condition, and then give symptomatic treatment. If the enteritis is caused by rotavirus infection, it is advisable to give anti-viral treatment, rehydration, maintain water-electrolyte balance, and reduce the burden on the gastrointestinal tract, etc. The condition can be significantly relieved. In addition, within two weeks, the diet must be light and digestive, do not eat spicy and stimulating food, as well as cold and greasy food to avoid aggravating the burden on the gastrointestinal tract.