Lumbar disc herniation does not cause pyriformis syndrome, and the pathological causes of lumbar disc herniation and pyriformis syndrome are different. Piriformis syndrome refers to the thickening and contracture of the piriformis muscle caused by trauma to the buttocks and long-term poor posture, which causes the sciatic nerve located here to be compressed and produce clinical symptoms, and the underlying pathological cause is due to the lesion of the piriformis muscle; whereas lumbar disc herniation does not cause lesions of the piriformis muscle, and therefore does not cause piriformis syndrome. Lumbar disc herniation is mainly due to degenerative changes in the lumbar vertebrae, or strain injury resulting in the nucleus pulposus of the intervertebral disc protruding and compressing the lumbar spinal nerve root causing a series of clinical symptoms, such as pain and discomfort in the lumbar back, which may be accompanied by pain and numbness in the lower limbs, or even restricted movement.