Breast cancer metastasis to lumbar spine must be advanced stage. According to the clinicopathological staging standard of breast cancer, when breast cancer has metastasis to lumbar spine, it means that distant metastasis already exists, and it is generally recorded as stage IV breast cancer, which belongs to advanced stage of breast cancer. Breast cancer is one of the most common malignant tumors in women, which can be divided into non-invasive carcinoma, invasive specific carcinoma, invasive non-specific carcinoma and other rare carcinomas. Breast cancer is a systemic disease, advanced breast cancer can have hematogenous metastasis, in which the cancer cells can directly metastasize to distant places through blood circulation, among which, the most common distant metastasis site is bone, followed by lung and liver. When patients have symptoms related to breast cancer, it is recommended that they go to the hospital as soon as possible to avoid delaying their condition.