There are several possible causes of pain in the middle of the back when bending: first, supraspinous ligamentitis or interspinous ligamentitis, chronic aseptic inflammation of the supraspinous ligament and interspinous ligament due to strain and cold, the symptoms of pain in the middle of the back when bending can occur, then the relevant examination and examination should be conducted to exclude other diseases for diagnosis and treatment; second, osteoporosis, when osteoporosis can also occur when bending back The symptoms of pain in the middle of the back when bending can occur when osteoporosis is present, then the relevant X-rays and blood tests should be performed for early diagnosis and treatment; third, rheumatoid, when rheumatoid diseases involve the spine, the symptoms of pain in the middle of the back when bending can also occur, then the relevant blood tests and X-rays, CT, nuclear magnetic examination for early diagnosis and treatment; fourth, ankylosing spondylitis, ankylosing spondylitis patients can also The back pain can occur when bending over, so blood tests and examinations should be performed for early diagnosis and treatment.