There are two reasons for lumbago during menstruation: first, the pelvis is congested when menstruation occurs, and if the uterus is in retroflexion and retroversion, it will stimulate the retroperitoneum, so it will cause lumbago symptoms. Secondly, if there is inflammation in the sacral ligament, there will be local congestion in daily life, which will aggravate the congestion during menstruation, so the symptoms of lumbago will appear during physiological period. In clinical practice, you can rest on your stomach in a prone position during menstruation and do hot compresses on the lumbosacral area will improve the symptoms of lumbago. You can drink hot brown sugar water to make the menstrual blood flow more smoothly can also improve the symptoms of lumbago, if there is inflammation of the sacral ligament should be actively given anti-inflammatory treatment.