Lumbar pain with buttock and leg pain may be caused by lumbar disc herniation, lumbar spinal stenosis or lumbar spondylolisthesis. 1. Lumbar disc herniation: degenerative changes or trauma caused by disc degeneration, rupture of the annulus fibrosus, the nucleus pulposus protrudes and compresses the nerve root, resulting in lumbar pain, sciatica or radiating pain in the lower limbs and other symptoms. 2. Lumbar spinal stenosis: aging and deformation of the lumbar spinal canal, trauma, osteophytes at the posterior margin of the vertebral body, etc., reduce the volume of the spinal canal and stenosis, which can cause lumbar pain, pain and numbness of the lower limbs, and numbness of the perineum when the cauda equina is compressed. 3. Lumbar spondylolisthesis: congenital dysplasia, degenerative changes in the lumbar intervertebral discs or traumatic impact can cause lumbar spondylolisthesis, resulting in lumbar pain, lower extremity numbness or radiating pain and other symptoms. If the symptoms continue to be unrelieved, you should go to the hospital in time to consult the doctor and standardize the treatment under the doctor’s guidance.