There are several common cases of lumbar lordosis: 1, the presence of developmental deformities of the spine, such as lumbar scoliosis, caused by abnormal spinal development during embryonic development. 2, fractures of the lumbar spine, fractures are not rescued in a timely manner, there is a deformed healing or joint malalignment appears scoliosis. 3, postural compensatory scoliosis, common in lumbar disc herniation and lumbar muscle strain. This is a self-protective mechanism. 4, poor posture, mostly seen in adolescents, this age is the peak of bone development. If you do not form a good sitting and standing posture for a long time in life and learning, over time there will also be lumbar spine bending.