80 years old rectal cancer patients can choose surgery, radiotherapy, chemotherapy and targeted, immune and other methods of treatment under doctor’s guidance according to the disease condition and body tolerance. 1. Surgery: Surgery is the main treatment method for rectal cancer. If the stage of rectal cancer is early, for example, the primary tumor of rectum is located in the mucous layer or submucous layer, there is no regional lymph node metastasis or distant metastasis, and the patient’s cardiorespiratory function is still good, the tumor can be locally removed by surgery. 2. Radiotherapy: radiotherapy is one of the main methods of non-surgical treatment for rectal cancer, which can play a role in local control of the tumor, and can be applied to some elderly people who can tolerate radiotherapy. 3. Chemotherapy: chemotherapy is also one of the treatments for rectal cancer, 80 years old rectal cancer patients are unable to tolerate conventional chemotherapy, but some of them can try to reduce the dose of single-agent oral chemotherapy, such as capecitabine, which is one of the commonly used drugs for elderly patients. Some patients can also combine targeted and immunotherapy according to genetic testing. Therefore, 80-year-old rectal cancer patients are advised to ask their specialists for a detailed evaluation and choose the appropriate treatment for them.