The pubis is located in the anterior lower part of the hip bone and is divided into the body and the superior and inferior branches. The body of the pubis constitutes the anterior and inferior part of the acetabulum, which is relatively hypertrophic, and from the body two superior branches of the pubis protrude anteriorly and medially, curving downward to migrate to the inferior branch of the pubis. The upper edge of the upper branch of the pubic bone is thin and sharp, known as the pubic comb, backward and the arch line continues, forward finally rounded elevation, as the pubic bone nodes, which is an important body surface marking, extending inwardly to the upper edge of the pubic symphysis, that is, the crest, collectively referred to as the crest of the pubic bone. The upper and lower branches of the pubic bone migrate medially to an ovoid comb-like surface, which is called the symphysis pubis. Pubic bone and sciatic bone surrounded by a large hole is called the closed hole, along the navel to the median line of pressure found a hard bony things called the pubic symphysis, pubic bone pain is located in the pubic symphysis of the place. To put it simply, if you follow the belly button and press down along the center line of the abdomen and feel something hard and bony, it is called the pubic symphysis, which is usually called the pubic symphysis, and most of the pain in late pregnancy occurs in this position.