After a lumbar sprain is relatively light is muscle strain injury, serious may be small joint disorders, or even lumbar disc herniation, there will be very obvious pain, in the pain stimulation, lumbar spine range of motion is limited. Due to a self-protective reaction of the human body, it will find a special posture to make the pain as less as possible, so it will feel a bit straight to bend the waist itself. However, this change in state is only temporary, and if the pain and other symptoms are gradually reduced through recuperation and systematic treatment of the above-mentioned lesions, the posture of not being able to straighten up can be gradually restored. And after this situation is well, daily life should also pay attention to the maintenance of the lumbar spine, otherwise too much strain, strain will cause chronic lumbar strain recurring episodes, and is not easy to completely cure.