When a patient eats bad food and has diarrhea, the condition is commonly known as acute gastroenteritis, which is directly related to the bacteria in the food consumed and the damage to the mucosa of the gastrointestinal tract caused by bacterial infection. This disease is mostly self-healing and will get better in about a week. If the symptoms are heavy, medication is needed to intervene, commonly used drugs are levofloxacin lactate, furazolidone and cephalosporin III antibiotics, usually 3-5 days to improve. When the symptoms of diarrhea are heavy, it needs to be treated with montelukast to stop diarrhea. Heavy diarrhea can cause excessive loss of water and electrolytes, so it is necessary to replenish water and electrolytes in time to prevent dehydration. In addition, during the period of diarrhea, you need to eat less spicy, fried and other stimulating food, to a light diet, you can drink thin rice or millet porridge.