Colorectal cancer is a relatively common malignant tumor of the digestive system. Colorectal cancer may also lead to death, for example, advanced colorectal cancer with extensive metastasis and spread and no way to control the development of the disease, leading to the failure of vital organs, which will directly lead to death. In addition, colorectal cancer may also cause blood in stool or severe anemia and hemorrhagic shock, which may also lead to death, if the symptoms of colorectal cancer are not controlled. If colorectal cancer is detected in time and can be treated surgically, it can still be controlled and prolong the survival period. For example, if colorectal cancer can be considered for surgery, it is generally possible to preserve anus, if not, fistula surgery can also be done, and after surgery, together with adjuvant chemotherapy and radiotherapy, it is possible to achieve clinical cure. Many early and intermediate colorectal cancers can be cured clinically without recurrence for more than 5 years. Of course, death may occur later, but the cause of death is not necessarily caused by colorectal cancer itself, but also by other internal diseases.