Low back pain that occurs after a normal delivery is usually relieved gradually after 5-10 days. The pressure of the uterus on the lumbar region during pregnancy and the pressure of the uterus on the lumbosacral region during natural childbirth can cause lumbar pain after delivery, and the contraction of the uterus after delivery can also cause lumbar pain. There are individual differences in the duration of postpartum lumbar pain, which can be gradually relieved after 5-10 days. Physiotherapy and massage can effectively relieve lumbar pain. During the recovery period, you should pay attention to rest, avoid overexertion, and avoid prolonged standing and sitting, which may aggravate the lumbago. Pay attention to the warmth of the lumbar region to avoid back pain caused by cold in the lumbar region. If you still have lumbar pain for a long time after delivery, it may be caused by other diseases, such as lumbar muscle strain, lumbar disc protrusion, etc. You need to go to the orthopedic department of the hospital for examination and treatment.