If there is a problem with the lumbar spine and the nerve is compressed, it may be due to the following reasons: 1. Basically, it is due to a herniated lumbar disc that compresses the sciatic nerve and causes pain in the buttock or involves the back of the thigh and the calf. 2. 3. It may also be due to more serious osteophytes or other tumor lesions, which may cause pain in the hip due to compression. After this happens, it is recommended that the patient go to the hospital in a timely manner for CT and MRI examinations of the lumbar spine to find out specifically which disease is causing the pain and then consider appropriate treatment measures.