The reason why women get back pain when they have menstruation is mainly due to the influence of hormone level in the body, which causes the pelvic cavity to be in a state of congestion and edema, thus stimulating the lumbar muscles, fascia and other tissues and triggering the symptoms of back pain in women. If the pain is mild and does not require treatment, it is recommended that women pay more attention to rest and massage properly to relieve it, which will slowly ease and disappear after the menstruation is clean. If the pain is more serious and does not disappear after the menstruation, it is considered to be caused by gynecological inflammation, such as pelvic inflammatory disease, cervicitis, etc., so you should go to the hospital in time.