Lumbar disc herniation compresses nerves for the following reasons: 1, lumbar disc herniation compresses nerves: the nucleus pulposus compresses nerve roots after lumbar disc herniation rupture; 2, spinal stenosis compresses nerves: lumbar disc herniation, especially in the elderly, can be accompanied by spinal stenosis, spinal stenosis is a bony spinal canal structure, including congenital stenosis and acquired degeneration, and the bony spinal canal position that accommodates nerve roots is narrowed, causing compression of nerve roots; 3, vertebral instability or slippage compresses nerves: some accompanying vertebral instability and vertebral slippage can compress nerve roots.