The possible causes of lumbar spine instability include trauma, strain in the lumbar spine area, lumbar disc herniation, and lumbar spine infection. 1. Trauma: Trauma caused by intense violence or falling from a high place may cause lumbar instability. 2. Lumbar spine strain: Lumbar spine strain may be induced due to excessive exercise intensity, poor lifestyle habits, etc., which may lead to lumbar spine instability. 3. Herniated lumbar intervertebral discs: living in a cold and wet environment for a long time, and often carrying too much weight may induce lumbar intervertebral disc herniation, resulting in lumbar spine instability. 4. Lumbar spine infection: such as septic, tuberculosis, brucellosis, and tumors destroying the structure of lumbar vertebrae can also lead to lumbar spine instability. Also, some congenital disorders such as congenital isthmic cleft may lead to lumbar spine instability. Lumbar spine instability may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.