If you experience lower back pain during menstruation, it is mainly caused by dysmenorrhea, which occurs when the endometrium synthesizes too much prostaglandins, thus causing abnormal contractions of the uterus and pain. In response to this pain, there are five main ways to reduce the symptoms of pain. First, if the pain is severe and unbearable, you can use ibuprofen to relieve the pain, but it is not recommended to take it for a long time. Secondly, it is important to keep the lower back and abdomen warm to prevent the pain from getting worse due to cold. The third is that if a woman is not pregnant, she can use birth control pills to inhibit the synthesis of prostaglandins, thus reducing the symptoms of pain. Fourth, in normal life, you should wear loose clothing and not let your clothes get too tight. Fifth, avoid eating cold, spicy and stimulating foods during menstruation.