Every time you lie down, there is a feeling of swaying in the back belongs to the manifestation of lumbar spine instability, lumbar spine instability may be due to congenital abnormalities in the development of the spine, but also due to acquired degenerative lesions of the lumbar spine. 1. Congenital causes: such as congenital scoliosis, spinal arch root isthmus fracture, etc., congenital developmental abnormalities can appear in the lumbar spine instability, resulting in an imbalance of strength between the two sides of the spine, soft tissue tension, strain, joints, etc., and the symptoms may become more obvious due to the relaxation of the joints and soft tissues after lying down. 2. Acquired causes: such as lumbar disc herniation, lumbar spondylolisthesis. Degenerative lesions of the lumbar spine will lead to narrowing of the vertebral body space, lumbar muscle ligament tension, soft tissue around the joints to reduce the holding power and other pathologic changes, lying down will also appear after the back of the feeling of swaying. There may be other reasons for the feeling of swaying in the back after lying down, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.