Back pain when the period has not yet arrived indicates that this time is the performance of PMS before menstruation, indicating that it has not yet reached the time of progesterone withdrawal, so menstruation will not come, this time must pay attention to personal eating habits and habits of rest, because the pelvic blood vessels continue to be in a state of expansion, with excessive exertion it can cause aggravation. If you eat some spicy, stimulating, raw and cold food, it can also cause severe menstrual cramps and severe lumbar pain when menstruation comes, so you should pay attention to it, you can relieve the lumbar pain before menstruation by means of local hot compresses or massage, you can wait patiently for menstruation and relax. If excessive tension and anxiety, persistently in a high-pressure state, it can cause a long delay in menstruation, so this time must also be adjusted to their mindset.