Lumbar bone curvature is common in the normal physiological curvature of the spine or the elderly hunchback and other physiological factors, but also can be seen in the scoliosis, lumbar disc herniation, bone fracture and other pathologic factors. 1. Physiological factors: the normal human spine has 4 physiological curves, located in the neck, chest, waist and sacrococcygeal area, which can provide good bony support and mobility for the activities of the spine, which is a normal phenomenon. In addition, the elderly due to muscle relaxation, osteoporosis and other reasons, will gradually cause the physiological curvature of the thoracic and lumbar spine to become larger and lead to the phenomenon of hunchback. 2. Scoliosis: The cause of scoliosis is complicated, usually related to family history, cerebral palsy, muscle spasm, etc. In addition to the curvature of the lumbar vertebrae, the patient usually suffers from back pain and numbness. 3. Herniated lumbar intervertebral disc: If the patient has herniated lumbar intervertebral disc for a long period of time, and the symptoms are more serious, it may cause imbalance of muscle force on both sides of the lumbar spine, which may cause deformation of the lumbar bones, and the lumbar bones will be bent. 4. Fracture: If the patient has a fracture of the lumbar region, it can be clearly seen that the lumbar bones may be bent, and the patient will usually be accompanied by pain in the lumbar region and limited activities. Causes of lumbar bone bending more causes, may also be related to spinal tuberculosis, ankylosing spondylitis and other diseases, if the symptoms continue to be unrelieved, it is recommended to go to the hospital in a timely manner by the doctor to find out the cause of the disease, for targeted treatment.