Symptoms of lumbar pain ten days after rectal cancer surgery may be caused by prolonged bed rest after surgery, or metastasis of rectal cancer, or caused by lumbar muscle strain of rectal cancer patients themselves. Symptoms of persistent or progressive lumbar pain should be consulted in time to find out the cause of the disease. 1. Caused by bed rest after operation: rectal cancer is a common malignant tumor of digestive system, and surgery is the main treatment method for rectal cancer. After surgical resection of rectal cancer, patients may cause the symptom of lumbar pain due to long bed-ridden time. After surgery, patients should go down to the ground at an early stage or do deep breathing and other activities in bed. 2. Metastasis of rectal cancer: Rectal cancer is of high malignant degree and prone to invasive growth and metastasis. When recurrence or metastasis occurs after rectal cancer surgery, such as when the cancer is transferred from iliac vein to lumbar vertebrae, lumbar pain can appear. 3. Lumbar muscle strain: the main symptom of lumbar muscle strain is recurring widespread lumbar pain, and serious patients may be accompanied by activity inconvenience. After rectal cancer surgery, due to long bed rest time and keeping single posture for a long time, lumbar muscle strain is easy to occur. If the symptoms of lumbar pain appear ten days after rectal cancer surgery, patients should consult doctor in time to get a clear diagnosis, and if necessary, the doctor should provide targeted treatment, such as taking ibuprofen, diclofenac sodium and other pain relieving medicines to treat the pain.