There are three main reasons for the pain of bending down: first, due to strain on both sides of the lumbar erector spinae, interspinous ligament, supraspinatus ligament and other soft tissue structures, will form in the local inflammatory edema and bruising and swelling, and then bending down will be the damaged muscles and ligaments to produce further tension stimulation, which will lead to obvious pain symptoms. Second, is due to lumbar strain, such as frequent bending and lifting heavy objects, sitting for too long, often squatting and long standing, sitting, may lead to lumbar muscular tissues overworked and the formation of strain, the formation of inflammatory foci in the local area, in the bending of the inflammatory foci will also produce tension stimulation of peripheral nerves produce obvious stimulation of the situation, there will be pain symptoms. Third, is due to lumbar hyperplasia, calcification and degeneration, such as cartilage degeneration around the obvious calcium salt deposition, the formation of calcified foci, after the formation of hyperplasia will produce pressure on the surrounding tissue structure, especially when bending over, the soft tissue pressure force increases will lead to more obvious pain.