The intervertebral disc is an important part of the spine, if that train analogy, bony vertebrae is each carriage, the intervertebral disc is the connection between the carriage, the intervertebral disc spinal movement of the foundation, no intervertebral disc is no spinal flexibility, because of this, it is also vulnerable to injury. The intervertebral disc is the hub that links the vertebral bodies, the structure between the lower part of the upper part of the upper part of the upper part of the upper vertebral body is the intervertebral disc, which structurally includes the surrounding fibrous ring and the central part of the nucleus pulposus. The fibrous ring is tough like a car tire, and the nucleus pulposus in the middle is jelly-like and is enclosed in a closed cavity formed by the fibrous ring and the upper and lower end plates. The function of the intervertebral disc is to carry pressure and play the role of cushioning pressure. The jelly-like substance of the nucleus pulposus distributes the pressure evenly on the end plate and the fibrous ring, which is elastic and makes the pressure cushioned, just like a car tire, equivalent to a “shock absorption system”, and a flexible joint. The degeneration of the intervertebral disc is the basis of spinal degeneration and is the initiating factor of spinal degeneration. The degeneration is manifested by the loss of water in the nucleus pulposus and the relaxation of the fibrous ring structure as it ages, and this change is uniform and consistent, making the vertebral space narrower, which leads to mechanical changes and degeneration of the small joints of the lumbar spine, causing back pain. When the degenerative strength of the annulus fibrosus decreases, the nucleus pulposus will expand around under pressure, which forms a bulging lumbar disc, but does not require treatment; when the annulus fibrosus ruptures, the nucleus pulposus is partially extruded from it, forming a herniated disc, which can be treated conservatively in the early and lighter stage; when the herniated nucleus pulposus falls out completely and is free in the spinal canal, it is called a prolapsed disc, which needs to be removed surgically; as the intervertebral disc increases in age, the water This explains why lumbar disc herniation occurs more often in young and middle-aged people and less often in the elderly.