Diarrhea caused by eating too much Cheerios should firstly be stopped, and secondly, diarrhea can lead to dehydration. If the dehydration is mild, oral rehydration salts are needed. If the dehydration is severe, intravenous rehydration is needed to correct the dehydration, and vitamins, amino acids, fatty milk, potassium and sodium are needed to correct the water-electrolyte and acid-base balance disorders according to the patient’s condition. For patients with severe diarrhea, antidiarrheal medications are needed, such as montelukast and bifidobacterium. If abdominal pain is present, 654-2 and atropine can be taken at the same time to relieve spasm and pain.