Patients with rectal cancer who have lymph node metastasis can observe enlarged lymph nodes on CT examination, mostly in pelvic lymph nodes, abdominal lymph nodes, subclavian lymph nodes and inguinal lymph nodes. Patients may present with symptoms such as abdominal pain and increased frequency of stool, and patients may show multiple lymph node metastases throughout the body. If metastasis to pelvic lymph nodes occurs, patients may experience increased pain in the lumbosacral region; if metastasis to abdominal lymph nodes occurs, it may manifest as abdominal pain; if metastasis to subclavian lymph nodes occurs, a mass in the supraclavicular and infraclavicular lymph nodes may be palpated, usually without special discomfort; if metastasis to inguinal lymph nodes occurs, a mass or lump may be palpated in the groin with a hard texture and may affect the movement of both lower extremities of the patient. If the metastatic lymph nodes cause lymphatic tract blockage, the patient may show signs of edema, such as edema of both lower extremities and scrotal edema, which may cause the patient to have unfavorable movement of both lower extremities. In terms of treatment, if the lymph nodes have few metastases and are not particularly close to the surrounding blood vessels, radical surgery should be performed. After surgery, the next treatment plan will be formulated according to the pathological examination results, and radiotherapy, chemotherapy, targeted drug therapy, etc. can be chosen.