Postpartum low back pain refers to the symptoms of lumbosacral pain after delivery, which usually occurs during the puerperium. There are many reasons for postpartum lumbago, mainly including ligament laxity, lumbar muscle strain, and cold in the lumbar area during the puerperium. Common causes 1, ligament laxity: maternal in pregnancy to meet the needs of fetal growth and development, calcium demand increased, if pregnant women fail to timely calcium supplementation, easy to lead to osteoporosis, and can last until after delivery. And pregnancy to prepare for childbirth, fixed bone ligaments are relatively lax, bone stability becomes poor, the surrounding muscles are easily damaged, thus causing posterior lumbar pain continues to postpartum; 2, lumbar muscle strain: maternal in pregnancy, the weight of the stomach becomes larger, the physiological curvature of the spine changes, a long time led to lumbar muscle strain, causing postpartum conscious lumbar pain; 3, puerperium lumbar cold: the puerperium is weaker, lumbar Cold can also lead to maternal pain in the lower back. Treatment 1, the mother should pay attention to calcium supplementation under the guidance of the doctor, to supplement the body calcium deficiency, to relieve the symptoms of osteoporosis; 2, can be appropriate heat compress in the area of lumbar pain, such as the use of hot water bags or fried salt and other ways of local heat compress. You can also apply topical ointment with blood circulation and blood stasis, swelling and pain relief, such as dog skin ointment, Zhenjiang ointment, etc. Attention to maternal daily rest, as far as possible to maintain bed rest, change the bad standing posture, sleeping posture, avoid maintaining the same posture for a long time, can be appropriate to relieve pain.