If you have back pain during menstruation, it is related to the following factors:1. Physical condition, relatively weak, will lead to the appearance of back pain symptoms during menstruation.2. It is possible that the uterus is in the backward-flexed and backward-tilted position, which will stimulate the posterior peritoneum during menstruation, and so back pain will occur.3. Inflammation of the pelvic cavity will lead to the worsening of pelvic congestion during menstruation, and so back pain will appear.4. Chronic Inflammation of the cervix can also lead to back pain during menstruation. Therefore, there are more reasons for back pain during menstruation, so you should have a checkup after your menstruation is clean, and give treatment according to the result of the checkup. If the posterior flexion and tilt position leads to back pain during menstruation, it is recommended to lie on your back and rest on the bed when you have your period, and it is also recommended to drink a bowl of hot brown sugar water to make the menstrual blood flow more smoothly and relieve this back pain, or apply hot compresses on the lumbar area, which can also improve this symptom.