Aunt refers to menstruation, and back pain during menstruation is related to hormonal changes during menstruation, pelvic inflammatory disease, endometriosis, adenomyosis and uterine fibroids. 1. Hormonal changes during menstruation: During menstruation, in order to promote the discharge of menstrual blood, the level of prostaglandins in the body rises, which in turn causes the uterus to contract, and the contraction may pull on the lumbosacral nerves and cause back pain. 2. Pelvic inflammatory disease: During menstruation, the uterus and other organs become congested, which may lead to increased local inflammation, and some patients may suffer from low back pain and other discomforts. 3. Endometriosis: If there is attachment of ectopic endometrium in the lumbosacral region or uterine rectal recess, etc., the ectopic endometrium will also be congested and bleeding with the cyclic changes of the ovaries, so it will stimulate the patient to have low back pain. 4. Uterine adenomyoma or uterine fibroids: for patients with uterine adenomyosis or relatively large uterine fibroids, there is a possibility of back pain and abdominal pain and other discomforts during menstruation due to the stimulation of lumbosacral nerves. For patients with very painful waist during the period, it is recommended that they go to the hospital to improve the ultrasound and other related examinations to clarify the cause of the disease and then actively treat it.