There are several causes of back pain during menstruation in women: a. An increase in prostaglandins. Prostaglandins are mainly found in the reproductive system of men and women. Most menstrual pain is caused by excessive prostaglandin synthesized by the endometrium, causing contraction and spasm in the smooth muscle of the uterus, resulting in dysmenorrhea, which eventually also radiates to the lower back and causes back pain. Second, caused by cold food. If you eat cold and stimulating food during menstruation, especially in the summer, many girls like to drink cold drinks, which can cause pain in the lower abdomen, and later also infect the lower back, causing back pain. Third, take cold baths. If you take a cold bath or tub bath during menstruation, it will also lead to cold in the female uterus, menstrual blood can not be discharged in time and cause dysmenorrhea, which will eventually also radiate to the waist. Fourth, the reproductive system diseases. Nowadays, the incidence of inflammatory diseases in the female reproductive system is increasing, such as adnexitis, pelvic inflammatory disease, ovarian inflammatory disease, etc. These inflammatory diseases are particularly likely to cause pain in the lower abdomen. Five, abortion too many times. In the process of doing abortion, the bruised blood will easily flow to the pelvic cavity, and the lesion will also block the pelvic cavity, or too much scraping will cause the position of the uterus to move, thus compressing the nerves in the lumbar region, which will eventually lead to lumbago every time you have your period.