The symptoms of back pain in breast cancer patients are not necessarily bone metastasis, but may also be related to other factors such as inflammation, trauma and internal organ diseases. Breast cancer patients who develop bone metastasis and cause chondrosarcoma, osteosarcoma and other diseases can cause invasion to thoracolumbar vertebrae and nearby soft tissues, which in turn cause low back pain. However, this symptom alone cannot confirm the diagnosis of cancer metastasis, and the possibility of other diseases should also be considered. Common violent injuries, chronic cumulative injuries caused by prolonged overexertion, rheumatoid arthritis, spinal infections, pyelonephritis, angina pectoris, urinary stone disease and herpes zoster can also trigger back pain symptoms. The causes of back pain are complex. It is recommended to consult a doctor as soon as possible to confirm the cause and follow the doctor’s instructions to give targeted treatment.