Reasons for postpartum low back pain: The first one, because there are drastic changes in hormones after delivery, and this is just after delivery, hormonal changes will also cause ligament relaxation. Second, the muscles and the entire ligaments of the low back are more strained and more painful after childbirth, which is a common reason. The third and most common reason is that after childbirth, not only strain but also hold the child, take care of the child improper posture, easily cause pain caused by bad posture. Fourth, the previous disease of the lumbar spine, this time after childbirth, coupled with strain, cold, this disease is more obvious aches and pains. The fifth, there is a significant change in weight, the center of gravity has also changed after the birth, and because of strain and childbirth, muscle damage will easily produce pain. The specific need to go to the regular hospital check clear or pay attention to rest hot compresses, breastfeeding can not use drugs can be rest-based, really serious pain does not ease to go to the regular hospital check.