Misuse of expired food leading to diarrhea is considered to be acute gastroenteritis, patients can take montelukast, bifidobacteria, amoxicillin and other medication, general measures to regulate and other treatment modalities. 1. medication: patients with acute gastroenteritis can take oral montmorillonite powder as prescribed by the doctor, belonging to the intestinal mucosal protective agent and adsorbent, can reduce the frequency of diarrhea. Patients can also take oral amoxicillin capsules, cefixime tablets and other antibiotics for anti-bacterial infection treatment, as well as bifidobacterium triplex capsules, Saccharomyces boulardii and other micro-ecological preparations. 2. General measures: patients with acute gastroenteritis should pay attention to their diet during the treatment period, focusing on light and easy to digest, such as rice porridge, noodle soup, etc., and eat less spicy and stimulating food, such as chili peppers and onions. Patients should eat fresh food and should not eat spoiled and expired food. Patients who have diarrhea caused by misuse of expired food should consult a doctor in time and follow the doctor’s instructions to avoid aggravating the patient’s condition.