There is no scientific basis for the claim that 3 symptoms after a meal indicate bowel cancer is not real. Bowel cancer mainly occurs in the rectum and colon, and it is also a relatively common malignant tumor in the digestive tract. The cause of the disease is still unclear, and it may be related to hereditary factors, genes, life style and other reasons. Common symptoms include constipation, diarrhea, bloody stools and abdominal pain. If you have symptoms similar to intestinal cancer, you need to go to the hospital to confirm the diagnosis by understanding your medical history and symptoms, and combining laboratory tests, endoscopy and pathological biopsy. It is not possible to diagnose a certain disease by a single symptom, this method does not have any scientific basis, and if the diagnosis is not correct, it may also lead to the condition missing the best time for treatment, which will cause harm to the health of the body.