1, reproductive system diseases – reproductive organ inflammation (such as tubal inflammation, pelvic inflammatory disease), endometriosis, abnormal uterine position (such as posterior tilt, posterior flexion), pelvic tumors (uterine fibroids, cervical cancer, ovarian cysts) and other reproductive organ disorders, can cause back pain. 2, urinary system diseases – urinary tract infections (such as acute and chronic pyelonephritis), urinary tract stones, tuberculosis and other disorders can also cause back pain. 3.Placement of birth control device – after the placement of the ring in women with posterior uterus, the stimulation of the foreign body, coupled with the backward shift of the center of gravity, pulling the ligaments and nerves will cause low back pain. 4.Pregnancy – due to the increasing size of the fetus, the lumbar support force increases, resulting in the relaxation of the sacrospinous ligament, which compresses the pelvic nerves and blood vessels and causes lumbago. This kind of low back pain can gradually disappear with the recovery of lumbar muscle strength after delivery. 5, lumbar muscle strain – excessive fatigue, abnormal standing and sitting posture, as well as too tightly girded waist, etc., can lead to lumbar muscle strain and cause lumbago. 6.After lower abdominal surgery – Some women undergo cesarean section, ovarian tumor resection or appendicitis, due to intraoperative bleeding or inflammation, adhesions occur in the pelvic cavity, resulting in lumbago after surgery. 7, joint lesions – women with rheumatism and rheumatoid arthritis may also experience heavier back pain. 8, lumbar spine lesions – Mostly seen in older women, as they age, the symptoms of lumbar spine nerve compression will increase. Such as herniated discs, etc. In addition, too much childbirth, too many abortions and indiscriminate intercourse can cause lumbago.