In early stage of bowel cancer, patients usually have no clinical symptoms, in middle stage of bowel cancer, there will be blood in stool and increased frequency of stool, and in advanced stage of bowel cancer, there will be intestinal obstruction, emaciation, weakness and other manifestations. If it is early stage bowel cancer, the lesion is very limited and there is no obvious swelling, so it usually does not lead to obvious clinical symptoms. If it is mid-stage bowel cancer, swelling will appear in the intestinal lumen, and the swelling will be broken, which will lead to increased frequency of bowel movement, or even diarrhea, and will also lead to blood in stool. If it is advanced bowel cancer, besides the increase of stool frequency and blood in stool, there may be intestinal obstruction, and there will be symptoms of gradual consumption, such as diet, decrease, emaciation, fatigue and so on, and there will also be clinical symptoms such as abdominal pain, abdominal distension and nausea. It is recommended to consult the hospital and standardize the examination and treatment.