People will experience diarrhea, abdominal pain, nausea and other uncomfortable symptoms when they eat expired and spoiled food, raw and cold food, spicy and irritating food, and many other foods that are not good for their health. When people suffer from diarrhea, it is recommended to go to the hospital for further examination to clarify the cause of the disease and treat the cause. 1. Expired and spoiled food: when the food spoils after the expiration date, it will produce a lot of bacteria, which will stimulate the mucous membrane of the gastrointestinal tract to undergo an inflammatory reaction and cause diarrhea symptoms. 2. Cold food: excessive intake of cold food (e.g. ice cream, etc.) will cause the gastrointestinal tract to spasm, resulting in diarrhea. 3. Spicy and irritating food: excessive intake of spicy and greasy food will stimulate the mucous membrane of the gastrointestinal tract and make the gastrointestinal peristalsis faster, resulting in diarrhea.