Postpartum thigh pain, the following common causes: 1, muscle strain, the process of childbirth, the mother will consume a lot of physical strength, the muscle will produce a lot of lactic acid, stimulating nerves, will lead to thigh pain symptoms, after massage, hot compress treatment, the symptoms will disappear completely. 2, lumbar disc protrusion, pregnancy increases the weight of the body, will make the intervertebral disc load significantly increased, promote the degeneration of the intervertebral disc, thus causing lumbar disc protrusion. The continuous increase in abdominal pressure during childbirth can trigger the onset of lumbar disc herniation, and the patient will experience thigh pain after childbirth, along with lumbar pain and restricted movement, and a corresponding decrease in leg muscle strength, which can be gradually relieved or even completely disappeared through bed rest and physical therapy for the lower back.