The pubic symphysis is at the most anterior part of the pelvis, and its position on the body surface is five transverse fingers below it, at 7-9 cm. The pubic symphysis represents the center of the anterior aspect of the pelvis and is the point where the left hip bone and the right hip bone join. When the pubic symphysis is damaged, subcutaneous bruising in the area of the pubic symphysis can often be seen, such as separation of the pubic symphysis during trauma, or fracture of the proximal pubic symphysis can be seen in the area of the pubic symphysis can be localized pressure pain, swelling. When a pregnant woman gives birth to a child, the head of the fetus squeezes the pelvis, which can cause separation of the pubic symphysis, and therefore may result in an enlarged pelvis.