Diarrhea after drinking mutton soup is considered to be caused by food allergy, acute gastroenteritis, gastrointestinal dysfunction and other conditions. 1. Food allergy: people who are allergic to mutton may have a digestive allergic reaction after eating mutton soup, with symptoms such as nausea, vomiting, diarrhea, abdominal pain, etc., which may also be accompanied by skin allergy manifestations such as skin rashes and itchy skin. 2. Acute gastroenteritis: drinking spoiled mutton soup or uncooked mutton soup can cause the gastrointestinal tract to be infected by bacteria, parasites and other pathogenic microorganisms, followed by diarrhea, abdominal pain and other symptoms. 3. Gastrointestinal dysfunction: patients with gastrointestinal dysfunction will increase the burden on the gastrointestinal tract after drinking more greasy mutton soup, resulting in diarrhea. Appear after drinking lamb soup diarrhea, if the symptoms continue to get better or more serious symptoms are recommended to go to the hospital, under the guidance of the doctor to choose the appropriate treatment.