Bowel cancer is a common malignant tumor, and patients often have no symptoms or symptoms are not very obvious in the prodromal stage. Some of them may show indigestion, abdominal pain, change in stool traits, change in stool habits and other manifestations, which are easy to ignore. Therefore, when the above precursors and performance of their own or need to promptly seek medical advice to identify the cause. 1, indigestion: easy to appear poor gastrointestinal function, mainly manifested as indigestion, sometimes accompanied by abdominal distension, abdominal pain and other performance. It is easy to be misdiagnosed as stomach disease and ignored by patients. 2. abdominal pain: Patients may also have abdominal pain, often hidden pain, dull pain, etc. The specific location of the pain may be related to the location of the tumor. 3. stool trait change: the trait of stool changes, the stool is not shaped, becomes thin, or mucus-purulent stool, and patients may have black stool symptoms, and laboratory tests may suggest positive stool occult blood test after consultation. The laboratory test may indicate positive fecal occult blood test. 4. Change in stool habits: Patients may have change in stool habits, such as defecation once a day but now 2-3 times a day, or alternating diarrhea and constipation. 5. Abdominal masses: The location of abdominal masses may be related to the location of cancer, generally hard in texture and varying in size. It may also change with the change of body position, such as palpable when upright, but not palpable when lying down; 6. Other: Patients may also have symptoms such as decreased appetite, low food intake and weight loss. If bowel cancer occurs in the lower part of the rectum, diarrhea incontinence may occur. In addition, a small number of patients may also have unexplained anemia and ascites. Therefore, if the above symptoms appear, they should be dealt with in hospital in time, and professional examination, including endoscopy or pathological biopsy, should be carried out under the guidance of doctors, instead of blindly diagnosing on their own, so as not to delay the treatment. If bowel cancer is diagnosed, early surgery can be chosen to remove it under the guidance of doctors, and combined with radiotherapy and targeted therapy to improve the prognosis.