In late pregnancy due to ligament laxity, the head of the fetus descends will have a slight pubic bone pain, this situation is physiological. If the pain seriously affects walking, it is caused by pubic bone separation. It often manifests walking pain, localized pressure pain, and severe inability to turn over and move in bed. This situation is mainly in the late stages of pregnancy, fetal growth, uterine ligaments, pelvic ligaments pulling, if the lack of calcium will be more serious. In this case, the examination of the pubic bone area pressure pain, knocking pain, hip abduction, external rotation activities are limited. x-ray film pubic bone separation in 5mm. if this situation, the body can not bear weight, usually to lie down more, to prevent standing.