The symptoms of diarrhea when the stomach and intestines do not eat some greasy meat and fishy food are mainly considered to be directly related to gastroenteritis and irritable bowel syndrome. 1. Gastroenteritis: it affects the normal gastrointestinal function and leads to damage to the gastrointestinal mucosa. After consuming greasy meat and other difficult-to-digest food, it will further stimulate the gastrointestinal mucosa, leading to abnormal intestinal peristalsis, which in turn triggers diarrhea, abdominal pain and other symptoms. 2. Irritable bowel syndrome: the pathology of the disease is still unclear, but may have a certain relationship with food stimulation. And one of the main symptoms of this disease is diarrhea and constipation alternately. If you consume some greasy meat and other highly irritating foods, it may exacerbate the symptoms of irritable bowel syndrome and cause the patient to suffer from diarrhea, abdominal pain, constipation and other symptoms. It is impossible to confirm the diagnosis simply on the basis of the symptoms. If the symptoms occur for a long time, it is recommended to go to the gastroenterology department of the hospital as soon as possible for relevant examinations (e.g. colonoscopy, etc.).