There are many causes of lumbar involvement leg pain, the most common are caused by the following conditions: First, lumbar compression fractures, lumbar burst fractures caused by trauma to the lumbar spine, compression of the spinal nerve roots will cause leg pain in patients. Second, if the patient has lumbar spine tuberculosis, lumbar spine tumor, which invades the vertebral body and causes vertebral instability and spinal cord nerve injury, it will also cause the patient to have leg pain. Third, if the patient has lumbar disc herniation, lumbar spondylolisthesis or lumbar spinal stenosis, the compression of the spinal nerve will also cause the patient leg pain. Therefore, there are many causes of lumbar involvement leg pain, and the specific diagnosis needs to be made based on the patient’s symptoms and signs, and with the auxiliary examination.