Early stage bowel cancer patients may not have abdominal pain because in early stage of bowel cancer, the lesions are relatively small and the depth of invasion of intestinal canal is relatively shallow, so some patients may not have any symptoms, but only discovered unintentionally during the examination. Of course, some patients may have increased stool frequency, diarrhea and other related manifestations, so colonoscopy can reveal the lesions in the middle of the intestine and further confirm the diagnosis when pathological examination is done. After surgery, according to the postoperative pathology, we can determine whether the patient’s bowel cancer is in the early or middle stage, etc. Some patients may have abdominal pain, such as vague pain, distension and so on. As long as patients have some clinical symptoms, it is recommended to go to hospital for examination in time.