A herniated lumbar disc is usually in the middle of the lower back. The lumbar intervertebral disc is an important structure connecting the lumbar vertebrae and cushions the pressure load on the lower back. The nucleus pulposus is in the middle of the two vertebrae with a fibrous annulus on the outside. When the water content of the nucleus pulposus and the fibrous annulus decreases, the nucleus pulposus loses its elasticity, and the fibrous annulus ruptures under the action of an external force, and herniation occurs. Generally, the herniated position is in the middle of two vertebrae of lumbar vertebrae, and it is easier to herniate in lumbar 4~5 vertebrae and lumbar 5 sacral 1 position. In addition to these two locations, herniated discs can also occur in other lumbar vertebrae. Most patients have a central herniation, in which the nucleus pulposus protrudes from the posterior center and compresses the dural sac, causing pain in both legs. There are also lateral herniations, which herniate to one side, causing narrowing of the lateral saphenous fossa and compression of the nerve root, causing leg pain and numbness on one side of the leg. So the location of the herniation is not exactly the same for everyone, and can be seen in the clinic and determined by MRI films.