What is lumbar disc herniation? Lumbar disc herniation is due to degeneration and herniation of the lumbar disc, which stimulates the nerve root and sinus nerve to produce a series of clinical manifestations . What are the causes of lumbar disc herniation? 1, the degenerative changes of lumbar intervertebral disc: the degeneration of the nucleus pulposus is mainly manifested as a decrease in water content, and can cause instability of the push joints due to loss of water, loosening and other small pathological changes; the degeneration of the annulus fibrosus is mainly manifested as a decrease in the degree of firmness. 2, the role of external forces: long-term repeated external forces caused by the slightest damage to the lumbar discs over the years, aggravated by the extent of the degeneration. Weaknesses of the disc’s own anatomical factors: 1) The disc gradually lacks blood circulation after adulthood, and has poor repair ability. On the basis of the above factors, a certain triggering factor that can lead to a sudden increase in the pressure on the disc may cause the less elastic nucleus pulposus to pass through the annulus fibrosus, which has become less tough, thus causing the nucleus pulposus to protrude.