Low back pain after giving birth may be related to the following factors: 1, overwork, the middle and late stages of pregnancy due to the increase of the uterus, the pregnant woman’s center of gravity changes, the center of gravity and pelvic position tilted forward causing lumbar vertebrae protrusion, if more force, the waist will produce damage, after the birth of the child because of poor rest, the waist can not get a good recovery, coupled with the care of the child, the need for physical strength will produce low back pain. 2, the body Calcium deficiency, during pregnancy pregnant women need a lot of calcium to meet their own needs and the needs of the fetus, after delivery breastfeeding still needs a lot of calcium, if the calcium supplement is not enough will produce lumbago. 3, there are abnormalities in the lumbar spine, if there are diseases in the lumbar spine itself, such as osteophytes, lumbar spine slippage, etc., for some reason in the postpartum attack will appear lumbago. 4, if there is pelvic inflammatory disease, inflammation recurrence will also lead to lumbago.