The most common cause of lumbosacral soreness before menstruation is the presence of cervical inflammation that affects the sacral ligament, so the sacral ligament will have an inflammatory reaction. Due to the inflammation, local symptoms such as congestion and edema will appear, which will aggravate the symptoms of congestion and edema before menstruation, so it will manifest as soreness and pain in the lumbosacral region. It is recommended to have a gynecological examination to find out whether there is congestion and edema in the cervix and whether there is an increase in secretion and tenderness in the sacral ligament, and then give appropriate treatment. In addition, lumbosacral pain before menstruation may also be caused by chronic pelvic inflammatory disease, and a preliminary diagnosis can be made through gynecological examination. For inflammation of the sacral ligament and pelvic inflammation, active medication is recommended, and most patients will have their symptoms relieved after medication.