Rectal cancer liver metastasis usually manifests as abnormal bowel movement, right upper abdominal pain, and usually does not have the symptom of back pain. Rectal cancer is a malignant tumor originated from rectum, which is one of the common malignant tumors in digestive system with poor prognosis. Liver is the most important target organ for hematogenous metastasis of colorectal cancer, and liver metastasis also exists in some patients. Early stage colorectal cancer may have no obvious symptoms, but when the disease develops to a certain degree, there may be changes in defecation habit, changes in stool characteristics, abdominal pain or abdominal discomfort, abdominal mass, symptoms related to intestinal obstruction, and systemic symptoms, such as anemia, emaciation, fatigue, and low fever, etc. Patients with colorectal cancer combined with liver metastasis usually have liver metastasis. Patients with rectal cancer combined with liver metastasis usually do not have low back pain, but some of them may have low back pain after combined with bone metastasis and long-term bed rest, etc. In addition, there are many reasons for low back pain. In addition, there are many reasons for lumbar pain, such as lumbar muscle strain, urinary system infection, reproductive system disease, lumbar disc herniation, etc. Lumbar pain can occur. It is recommended to go to a regular hospital to evaluate the condition and follow the doctor’s instructions to actively cooperate with the treatment in order to improve the patient’s quality of life and prolong the survival period.