1, abdominal distension, abdominal pain The cause is due to intestinal dysfunction, or intestinal obstruction. The location is mostly concentrated in the middle and lower abdomen, mostly hidden pain or distension, and there is a tendency of gradual aggravation. 2.Blood in stool Because the lesion is closer to the anus, the blood color is mostly bright red or dark red, and often the blood and stool are separated, and only when the bleeding volume is larger, the stool is brownish red and jam-like. There are such in patients with right hemi colon cancer, and blood in stool visible to the naked eye accounts for 36. 5%. This also belongs to the early symptom performance of colorectal cancer. 3.Anemia When the long-term chronic blood loss exceeds the compensatory function of hematopoiesis of the body, the patient can have anemia as an early symptom of colorectal cancer. Tumor obstruction, when the tumor grows to a considerable size or infiltrates the muscle layer of intestinal wall, it can cause narrowing of intestinal canal, small intestinal lumen and obstruction of intestinal content. 4.Changes in stool habits and traits Patients with rectal cancer may have more frequent stools, but not much stool each time, or even no stool at all, only some mucus and blood are discharged, and there is a feeling of incomplete defecation. The change of stool habit and frequency, as well as constipation or unexplained diarrhea, may occur only when the colorectal tumor is relatively large and has erosion, ulcer or infection. If the cancer grows prominently into the rectal cavity, resulting in the relative narrowing of the intestinal cavity, the stool will often become thin and deformed, which may be flat, and sometimes some blood is attached to the deformed stool. What kind of people are prone to be stalked by bowel cancer? Patients who have had colorectal polyps have a higher chance of intestinal malignant change; those who have severe ulcerative colitis for many years without healing need to be alert to intestinal malignant change; those who have had gallbladder removal surgery for more than 10 years need to be alert to intestinal malignant change; those who regularly consume high-protein and high-fat food, and regularly smoke and drink alcohol. The postoperative diet care of intestinal cancer needs to be noted: the diet of postoperative intestinal cancer patients should be diversified, not partial and not picky, do not consume high-fat and high-protein diet for a long time, and often eat fresh vegetables and anti-cancer food. It is not advisable to eat spicy and stimulating food after intestinal cancer surgery, so as not to stimulate wound healing by diet. Patients should eat more foods with high protein and iron, such as animal liver, lean meat, poultry and eggs, milk, carp, duck soup, cinnamon, silver fungus, turtle, etc., to supplement the blood loss of patients in different degrees during surgery.