Cesarean section twelve days of back pain need to be treated according to the specific causes, such as anesthesia factors, too much exertion, hormone levels, etc., after a clear diagnosis to take general treatment, physical therapy. 1. Anesthesia factors: cesarean section may be carried out under lumbar anesthesia, anesthesia is more difficult during the operation, and the operation is carried out several times before it is successful, which may cause the phenomenon of postoperative back pain. It is recommended that the mother pay more attention to bed rest, avoid strenuous exercise, usually in one or two months after the operation will be relieved on their own, without special treatment. 2. Excessive exertion: the lumbar muscle strain caused by breastfeeding the baby after cesarean section and not getting a good rest will lead to the phenomenon of lumbar pain after twelve days of cesarean section. This phenomenon should pay more attention to rest, can be on the waist of the massage, hot compresses, so as to alleviate the symptoms. 3. Hormone levels: During pregnancy, due to the increase in estrogen and progesterone, causing ligament laxity throughout the body, so after cesarean section there may be back pain. This phenomenon will usually be gradually relieved by itself after the postpartum time increases, and no special treatment is needed. There are many reasons for back pain after 12 days of cesarean section, it is recommended to go to the hospital in time to complete the examination and make a clear diagnosis, and then take standardized treatment under the guidance of professional doctors after diagnosis.