Patients with early stage bowel cancer may present with abdominal pain, diarrhea, abnormal bowel habits and changes in regularity. At this time, if stool examination is performed, a positive fecal occult blood test (+) can be found, and the patient will have worsening symptoms after eating. Because the most malignant tumors of the intestine are caused by malignant intestinal polyps, and some patients have chronic ulcerative colitis, the patients usually have abdominal symptoms, which are easily confused with each other. Colonoscopy can make a clear diagnosis, and for early diagnosis of malignant tumors of the intestine, surgery should be chosen in time, because the prognosis is very satisfactory, and late malignant tumors of the intestine are prone to lymph node metastasis and hematogenous metastasis, and may even be complicated by a large amount of ascites.