A bone scan with mild abnormal metabolic activity in the fourth lumbar spine is not necessarily a bone metastasis, but metastasis is more likely, especially in patients with a history of cancer. Mildly abnormal metabolic activity in the fourth lumbar spine means that the bone metabolism is currently more active in this area, which may be due to bone metastasis, especially in patients with a history of cancer, as malignant tumors can cause abnormalities around the bones, one of the more common of which is bone metastasis from lung cancer. However, it is not necessarily bone metastasis, it may just be that the bone reconstruction in this location is more active, for example, the bone itself is caused by small bone contusion, or it is caused by serious fracture. At present, the patient should cooperate with the doctor to do further examination, and combine with the medical history to make a final diagnosis and then targeted treatment.