The lumbosacral region is the location where the belt is usually tied down and the middle of the hip is up. Pain in this area is mostly caused by two reasons: 1. It is sacroiliac arthritis, which is due to the inflammation of the sacroiliac joint, the cartilage will degenerate, forming local osteophytes and calcified lesions, and there may be sacroiliac joint worm-like changes, such as ankylosing arthritis, which can also form sacroiliac arthritis symptoms. The pain in the lumbosacral region is due to the inflammation of the sacroiliac joint and the pain caused by the stimulation of the peripheral nerves around it. 2. Since there are many muscles, tendons and ligaments attached to the lumbosacral region, violent bending or continuous lifting of heavy objects, prolonged sitting and squatting, twisting the waist and other actions may lead to strains and strains of the above soft tissue attachment points and the formation of sterile inflammatory lesions, which will cause pain to the peripheral nerves around it. The peripheral nerves are stimulated and painful sensations occur.