Lying down feeling waist hanging in the air lumbar pain symptoms may be caused by physiological factors sedentary, may also be caused by pathological factors lumbar intervertebral disc herniation, lumbar muscle strain. 1. Physiological factors: long-term sitting or standing, will lead to the body’s center of gravity is concentrated in the lumbar region, which is prone to cause lumbar spine structure of hyperplasia and other degeneration, and so that the physiological curvature of the lumbar vertebrae changes, and thus lying down will feel the lumbar hanging back pain symptoms appear. 2. Pathological factors: lumbar intervertebral disc nucleus pulposus structure to the annulus fibrosus protrudes, it will compress the surrounding sciatic nerve, thus causing lying down the lumbar hollow and pain symptoms. Long-term use of lumbar activities can lead to strain on the muscles of the lumbar region, resulting in aseptic inflammation, which in turn causes symptoms such as lumbar suspension pain. If you lie down and obviously feel the lumbar suspension and pain is strong, you should go to the hospital in time for consultation and treatment.