The most common clinical cause of low back pain and leg pain during menstruation is that the pelvic cavity is congested during menstruation, which affects the blood circulation in the lower limbs, resulting in low back pain and leg pain. It is recommended to soak the feet in hot water for 10-15 minutes every day to promote blood circulation in the lower limbs and improve this corresponding symptom. It is also recommended to rest as much as possible, which will also improve the symptoms of low back pain and leg pain. It is also possible that there is a tumor in the pelvic cavity. When the pelvic cavity is congested during menstruation, a relatively large tumor will compress and cause blood circulation problems in the lower limbs, resulting in lumbago and leg pain.