The entire lumbar spine has a forward physiological bend, the gap behind the lumbar spine is very small, and the surrounding muscles and ligaments are in a relaxed state, while the lumbar spine is very tense in the process of bending forward, the gap behind is relatively large, and the surrounding muscles and ligaments are often in a situation of strain and strain injury, which can easily occur. At this time if upright, because the upper body to lift completely, the muscles and ligaments behind the lumbar vertebrae need more force to complete the action, in the original strain, strain or muscle ligament damage will occur in the case of pain. At this point, it is suggested that there should be no more frequent bending movements, should rest in bed as much as possible, avoid sitting and standing for a long time, avoid wind and cold, otherwise the lesion will be further aggravated on this basis, and may even cause lumbar disc herniation.