Women’s back waist middle pain, usually caused by the following reasons: First, the supraspinous ligament inflammation, the supraspinous ligament is the longitudinal ligament on the surface of the spine spine, it appears inflammation will appear lumbar localized supraspinous ligament pain. Second, pelvic inflammatory disease, many women have pelvic inflammatory disease, in the back pain at the same time there will be small abdominal swelling, discomfort, do gynecological ultrasound for further diagnosis. Third, lumbar spine lesions, when the lumbar spine lumbar degeneration or lumbar disc herniation, this will also appear in the middle of the back of the waist pain, so this time to lumbar spine CT and nuclear magnetic examination to further confirm the diagnosis. Fourth, in the elderly can also appear osteoporosis back pain, this time to take a film examination, to rule out whether the lumbar spine osteoporosis or secondary lumbar spine compression fracture, these diseases can also lead to pain in the middle of the posterior lumbar region.