If a patient has gastroenteritis and has diarrhea and abdominal pain with nausea and vomiting in the last few days, it is mostly considered as acute gastroenteritis, which is directly related to bacterial infection. It can be clarified by laboratory tests of stool routine plus blood routine, and can be treated with levofloxacin lactate or cefadroxil injection after the diagnosis is confirmed. In addition, if the diarrhea is heavy, it will cause excessive water loss in the body, and there may be excessive loss of potassium and sodium, so potassium chloride and sodium chloride can be replenished by infusion. In addition, if the condition is more than one month, it is considered chronic gastroenteritis, which does not require infusion therapy, and can be treated with drugs that inhibit gastric acid and regulate intestinal flora, commonly used drugs are omeprazole plus rectification.