The cause of lumbar disc herniation, there are internal and external causes, the main internal cause is degenerative changes in the lumbar spine; external causes are trauma, strain or overwork, cold and moisture, etc.. I, degenerative changes in the intervertebral disc lack of blood supply, repair energy is weak, the daily life of the intervertebral disc by all sides of the extrusion, pulling and twisting effect, so that the intervertebral disc nucleus pulposus, fibrous ring, cartilage plate gradually aging, resulting in easy rupture of the fibrous ring, and cause the disc protrusion. Second, trauma Because the lumbar vertebrae are arranged in a physiological convexity, the disc is thick in front and thin in the back, when the patient in the lumbar injury, bruises, flash back, etc., the nucleus pulposus of the disc moves backwards, and the disc protrudes backwards. Third, excessive load When the lumbar overload, long-term bending work, such as: media miners or construction workers, need to bend over for a long time to pick up heavy objects, lumbar disc load more than 100 kPa / cm2, that led to rupture of the intervertebral disc fiber ring. Fourth, lumbar penetration as early as 1935 was found after the lumbar penetration of the vertebral space narrowing and disc protrusion reported. Fifth, long-term vibration car and tractor drivers in the driving process, long-term sitting and bumpy state, the lumbar intervertebral disc under excessive pressure, can lead to disc degeneration and protrusion. At the same time, vibration also affects intervertebral disc nutrition, the impact on microvascular can accelerate the disc protrusion. Nearly half of the lumbar disc herniations coexist with spinal stenosis. Intermittent claudication is the most prominent symptom of the disease. After walking for a certain distance, the lower limbs become sore, numb and weak, and can continue walking only after squatting and resting, while cycling and bed rest are mostly asymptomatic. The sensation, movement and reflexes of the affected limbs often do not have any abnormal signs and are mainly judged clinically; CT and MR examinations are helpful for diagnosis.