A bulge in the lumbar spine may be caused by scoliosis, trauma, degenerative changes, and so on. 1. Scoliosis: Long-term stooping work, poor posture for a long period of time, as well as a decrease in the strength of the muscles around the spine may lead to the straightening of the physiological curvature of the lumbar spine, i.e. scoliosis. Normal lumbar spine is concave from the back, but the physiological curvature of the lumbar spine disappears or even reverse curvature will cause a piece of the lumbar spine to bulge. 2. Trauma: If the lumbar spine is impacted by external forces, it is easy to cause structural changes in the lumbar spine, resulting in the phenomenon of lumbar spine bulge. 3. Degenerative changes: usually often stooping and weight-bearing labor, with the age of the lumbar spine easily caused by degenerative changes, will also trigger the symptoms. Lumbar spine has a piece of bulge may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.