The causes of diarrhea after eating barbecue are considered to be acute gastroenteritis, irritable bowel syndrome, and food allergic reaction. 1. Acute gastroenteritis: mostly caused by bacterial contamination of barbecue food, especially some meats and animal offal, which are not fully cooked during the barbecue process, may cause acute gastroenteritis, resulting in abdominal pain, diarrhea and even nausea and vomiting symptoms. 2. Irritable bowel syndrome: the patient’s gastrointestinal tract is more sensitive, eating barbecue food can easily cause diarrhea, abdominal pain and other symptoms, diarrhea can improve on its own. 3. Food allergic reaction: there are many kinds of food when eating barbecue, especially some people are allergic to seafood or meat, after eating, it is easy to have gastrointestinal allergic symptoms, manifested as diarrhea, abdominal pain and so on. In this case, it is recommended to avoid contact with allergenic foods. Eat barbecue after diarrhea patients, it is recommended to go to the hospital gastroenterology department, follow the doctor’s instructions for treatment.