Having diarrhea after eating is not necessarily bowel cancer, but can also be caused by conditions such as enteritis, dysbiosis and irritable bowel syndrome. Reasons such as eating too fast, eating spicy food can also cause this condition. 1. Bowel cancer: Early stage patients may have increased frequency of bowel movement, bloody stools, etc. Typical symptoms include blood in stool, abdominal pain, abdominal lumps, etc. Advanced stage patients may also have emaciation, fatigue, ascites, etc. They rely on colonoscopy, tumor markers, stool routine and other examinations for clarification. 2. Other diseases: such as enteritis with a history of unclean diet, diarrhea, abdominal pain and other symptoms; such as bacterial dysbiosis can have abdominal distension, diarrhea and other symptoms; such as irritable bowel syndrome can have abdominal distension, intestinal hyperpronunciation and other symptoms. 3. Dietary reasons: such as irregular diet, eating stimulating food can lead to intestinal absorption and peristaltic function abnormalities, diarrhea. For diarrhea after eating, it is recommended to consult a doctor to identify the specific cause. The possibility of intestinal cancer can be detected with the help of medical history, symptoms and auxiliary examination.