Lumbar 5 sacral 1 herniation is usually caused by disc degeneration, cumulative injury, pregnancy, bad life habits and so on. 1. Degeneration of the intervertebral disc: with age, the intervertebral disc will degenerate, the water content of the annulus fibrosus and the nucleus pulposus gradually decreases, and the intervertebral disc ruptures and protrudes backward under the action of cumulative strain and external force, which will cause corresponding symptoms when compressing the nerves. 2. Accumulative injury: For example, repeated bending and twisting over a long period of time can easily cause intervertebral disc injury, which is the main cause of intervertebral disc degeneration. 3. Pregnancy: During pregnancy, ligaments are in a state of relaxation, and the gradually growing abdomen will put the lumbar spine under greater pressure, thus increasing the risk of disc herniation. 4. Adverse lifestyle habits: for example, long-term desk work, heavy physical labor, etc., is also a common cause of disc herniation. Patients with lumbar 5 sacral 1 herniation should go to the hospital in time for further consultation and treatment if they experience episodes of back and leg pain.