The lumbar intervertebral discs are subjected to strong compressive stresses during loading and movement of the spine. After about 20 years of age, the intervertebral discs begin to degenerate and constitute the basic cause of lumbar disc herniation. In addition, lumbar disc herniation is related to the following factors: 1, trauma: observation of clinical cases shows that: trauma is an important factor in disc herniation, especially in children and adolescents, with which the onset of the disease is closely related. When the spine is lightly loaded and rapidly rotated, it can cause the horizontal rupture of the annulus fibrosus, while the compressive stress mainly makes the cartilage end plate rupture. It is also believed that trauma is only the causative factor of disc herniation, and the original lesion lies in the painless nucleus pulposus protruding into the inner annulus fibrosus, while the trauma makes the nucleus pulposus further protrude into the outer annulus fibrosus which is innervated outside, thus causing pain. 2, occupation: occupation and lumbar intervertebral disc protrusion (prolapse) of the relationship is very close, for example, car and tractor drivers in a long-term sitting position and bumpy state, so that when driving a car, the pressure within the intervertebral disc is high, up to 0.5kPa/cm2, in the clutch when the pressure can be increased to 1kPa/cm2, easy to cause lumbar intervertebral disc protrusion. Engaged in heavy manual labor and weight lifting sports due to overload is more likely to cause disc degeneration, because in the stooping state, if you lift 20kg weight, the pressure in the intervertebral disc can be increased to more than 30kPa/cm2. 3, genetic factors: lumbar intervertebral disc herniation has a familial morbidity reports, in the domestic material is less; in addition, statistics show that the incidence of Indians, African blacks and Inuit is significantly lower than the incidence of other ethnic groups, the reasons for which need to be further studied. 4, lumbosacral congenital anomalies: lumbosacral segment deformities can increase the incidence rate, including lumbar sacralization, sacral spine lumbarization, semi-vertebral deformities, micro-articular deformities and asymmetry of the articular eminence and so on. The above factors can make the lower lumbar spine bear the stress change, thus constituting one of the factors of the intervertebral disc internal pressure rise and prone to degeneration and injury. In addition to the main cause of this disease, i.e. degenerative changes in the intervertebral disc, various triggering factors also play an important role, for example, some factors that slightly increase the abdominal pressure can cause the nucleus pulposus to protrude. For example, some factors that slightly increase the abdominal pressure can cause the nucleus pulposus to protrude. The main reason is that, on the basis of degeneration of the intervertebral disc, some factors that can induce a sudden increase in the pressure of the intervertebral space can cause the nucleus pulposus to pass through the annulus fibrosus that has been denatured and thinned to enter the front of the spinal canal or pass through the vertebral plate to invade the edge of the vertebral body. Such triggering factors are as follows: 1, increase abdominal pressure: clinically about 1/3 of the cases before the onset of a clear increase in abdominal pressure factors, such as violent coughing, sneezing, breath holding, straining to defecate, or even “false honor” action, etc., you can make the abdominal pressure rise and destroy the balance between the vertebral segments and the vertebral canal. 2, lumbar posture: whether during sleep or in daily life, work, when the waist is in a flexed position, such as sudden rotation, it is easy to induce herniation of the nucleus pulposus. In fact, in this position, the pressure in the intervertebral space is also higher, which is easy to promote the herniation of the nucleus pulposus to the back. 3, sudden weight-bearing: a well-trained people, more than the first preparatory activities, or small weight to start weight-bearing (such as lifting weights, picking burdens, etc.) in order to prevent lumbar sprains or herniated discs, but if the sudden increase in the lumbar load, not only may cause lumbar sprains, but also prone to herniation of the nucleus pulposus. 4, pregnancy: the whole ligament system is in a relaxed state during pregnancy, the posterior longitudinal ligament relaxation is easy to make the disc bulge. In this regard, the authors conducted a relevant research study and found that at this time, the incidence of low back pain in pregnant women is significantly higher than that of normal people. In short, the lumbar intervertebral disc herniation triggering factors are more complex, although a variety of experiments, but due to the inference of animal experiments, fresh cadaveric specimens of the distortion, as well as to go to the spinal column around the limitations of biomechanical testing of tissues, etc., has not yet really find out the exact factors that trigger this disease and its mechanism, and to be further discussed in the future.