The crotch pain that occurs in late pregnancy is mostly caused by excessive stress or cold in the crotch area. As the fetus grows, the weight of the pregnant woman will gradually increase, and this will cause the crotch bone area to bear the weight of the pregnant woman excessively. Especially when the force is greater during activities, it is easy to cause edema and spasm in the soft tissues around the crotch bone area and the internal cartilage after the excessive force, which will cause the symptoms of crotch pain. In the late pregnancy, the pregnant woman’s whole body joints are in a relaxed state, preparing for maternity, and at this time it is easy to suffer from the erosion of cold wind, causing obvious soreness and pain in the crotch bone area.