Back pain before menstruation may be part of PMS. To some degree most women will experience back pain on or around the time of the menstrual cycle. This pain can be related to several factors such as stress, pregnancy, miscarriage or even many hormone disorders. However, there are other explanations for back pain that is experienced before a period. Premenstrual syndrome---PMS--- is a set of symptoms that occur before a woman's menstrual cycle begins.