If you have had prostate cancer for three years and have been experiencing significant back pain lately, you should go to the hospital for a prompt checkup. Usually, the doctor will arrange for a bone scan to determine whether bone metastases have occurred. If bone metastases are detected, timely treatment can significantly relieve symptoms and prolong the life span of the patient; it can prevent the occurrence of bone-related events such as fractures and spinal cord compression. If no bone metastasis is found in the clinical examination, drug therapy can also be applied to prevent the occurrence of bone metastasis, such as bisphosphonates are the first choice for the prevention and treatment of bone metastasis.