Lower back pain on the fourth day after abortion is not normal, the most common reason for this situation in the clinic is due to the lack of good rest after abortion, which leads to a decline in body resistance, so that the occurrence of lower back pain, or sit too long, walk more, no bed rest will lead to this situation. Suggest actively rest, and can do lumbar hot compresses, promote local blood circulation, can improve the symptoms of lumbago. If after rest or hot compresses, back pain can not be improved, it is recommended to go to the hospital for examination, to rule out chronic cervical inflammation caused by sacral ligament inflammation and back pain, and recommended to do gynecological examination, according to the situation of the clinical then give intervention.