The causes of leg pain after childbirth include muscle strain and lumbar disc herniation, as follows: First, muscle strain: patients who stand or sit for a long time to breastfeed will lead to serious strain on the leg muscles, which will manifest as leg pain and weakness, massage, physical therapy and hot compresses will gradually relieve the symptoms. Second, lumbar disc herniation: patients can occur after childbirth lumbar disc herniation compression nerve, so that the legs appear sore symptoms, usually in the early stage there will be obvious feeling, with the aggravation of symptoms, will lead to leg over inductance, lumbar spine CT scan or MRI examination can find the lesion site, lesion degree. Therefore, postpartum leg pain symptoms should be promptly consulted, and the clinical symptoms can be satisfactorily controlled by carefully investigating and diagnosing the cause and choosing the appropriate treatment. In addition, we should strengthen the leg muscle strength training, and control the weight and protect the lumbar spine.