Lumbar disc herniation, depending on the degree of protrusion, is divided into the following grades: Grade 1, the mildest type of protrusion, termed bulging, mainly because when the disc protrudes backward, thus squeezing part of the annulus fibrosus to protrude into the spinal canal, but the annulus fibrosus does not rupture, part of the disc protrudes backward resulting in bulging phenomenon, only a small part of the disc will protrude backward, but the degree of protrusion will be relatively mild, and The symptoms of nerve compression will also be relatively mild. Grade 2, herniated discs protrude posteriorly and most of the annulus fibrosus is ruptured, causing the disc to compress posteriorly into the dural sac or nerve roots, resulting in a herniated disc and more severe symptoms of nerve damage from the herniated disc. Grade 3, prolapse, is the most severe form of disc herniation. Prolapse means that the nucleus pulposus has completely fallen out and entered the spinal canal from the intervertebral space, resulting in severe symptoms of nerve compression, which must be treated by surgery.