When we are lying down, the lowest bony structure in the abdomen is part of the pubic bone, and at the intersection of the two pubic bones is the pubic symphysis formed by the fibrocartilage connection, which is a joint structure. The pubic symphysis is a joint structure. During pregnancy, the pubic symphysis becomes loose due to the influence of female hormones, and there will be a mild separation during delivery, which is a normal physiological change, and this change is beneficial to the delivery of the fetus. If the pubic symphysis is severely separated during pregnancy, pregnant women will feel pain, which is often referred to as pubic bone pain. Many pregnant mothers have pubic bone pain in the late pregnancy. Pregnant women who have pubic bone pain are those who have less exercise, bone and joint lesions or history of trauma before pregnancy. Pregnant women who often have back pain, spinal disease, frozen shoulder history before pregnancy are more likely to have pubic pain after pregnancy; those who have leg or pelvic trauma before pregnancy, the pelvis has changed shape, after pregnancy, with the increase of the uterus, fetal descent, pubic pain is likely to occur; pregnant mothers are O-legged, may also lead to pubic pain; if the fetus is too heavy and the mother is thin, also easy to have pubic pain during pregnancy; the use of forceps assisted delivery The use of forceps can aggravate pubic pain. If you have a history of back pain, frozen shoulder and spinal disease, you should have a spinal and pelvic examination before pregnancy to clarify the cause; pay attention to rest and nutrition during pregnancy, and pay attention to physical recovery after delivery.