Ms. Wang has been found to have chronic anemia in several medical checkups, and she has been adhering to the view that “medicine is better than food”, so she used the money she saved from not going to the hospital to buy The company has been “poor” Ms. Wang adhered to the “medicine is better than food” view, with the money “saved” not to go to the hospital bought a lot of nutrition and health products. During this period, Ms. Wang’s stools became more and more irregular, and constipation symptoms also gradually aggravated. “Friends” told her to eat too many high-protein nutrients and vegetables to eat less constipation. She did not take it seriously, after all, “anemia is more important”. One night, Ms. Wang suddenly had abdominal pain and stopped defecating and exhausting, so she went to our hospital for emergency treatment, and CT showed colon obstruction. The postoperative pathology showed hypofractionated adenocarcinoma, invading to the plasma layer, and lymph nodes in the intestinal wall (11/12) were metastatic – that is, it was already a middle and advanced stage of colon cancer. Relatively speaking, the right hemicolectomy is rich in blood supply and the colon cancer grows rapidly. As the cancer invades the blood vessels and causes ulceration and bleeding due to central type ischemic death, symptoms such as mucus and blood stool or bloody stool and anemia often occur. Thus, we found that Ms. Wang’s anemia had a cause. In view of the successive “blood” lessons and the increasing incidence of colorectal cancer, we need to emphasize once again that colonoscopy is necessary if there are adverse manifestations such as blood in stool, change in stool habit and anemia, including people over 50 years old or those with a family history of colorectal cancer, and should not be taken lightly like Ms. Wang!