Health - Pelvic bone pain, Pelvic bone pain during pregnancy

Pelvic bone pain

The pelvis is a ring structure. Progesterone, a hormone made in great quantities in pregnancy has many properties besides thickening the lining of the uterus for implantation. It also relaxes smooth muscle, which helps keep the uterus quiet (non-contracting) as the baby grows. A side effect of this is constipation, because it also relaxes the smooth muscle in the intestinal tract.

Progesterone also relaxes the ligaments between joints. In it's wisdom, the human body seeks to make the passageway (the pelvis) a larger space for the passenger (the baby). The middle of the pubic bone is actually a joint where the left and right pubic bones join together. When this loosens up, this in effect makes the diameter of the pelvis a larger space for the baby to negotiate during labor.

But unfortunately, since the pelvis is a ring, if it opens here, it must pinch there. The sacroiliac joints in your lower back to either side of the midline can hurt when this pubic bone separation happens. Or, alternately, you can just hurt at the pubic joint (the "pubic symphysis"). Diastasis is a word meaning "separation," so pubic symphysis diastasis is the normal effect of progesterone and other unknown forces that open up the pelvic ring a little bit for labor.


During late pregnancy hormones soften and relax these ligaments, making the pelvis elastic, rather than rigid. This gives the pelvic bones the ability to stretch and open more easily for the birth of the baby.

The pelvis is not fused and stretch open for the amazing process of birth.

The baby's skull bones are divided into 5 plates that cross over during labour, making their head smaller by moulding to fit the birth canal.

Being upright lets gravity help the pelvis to open and aids the descent of the baby during labour.

The topic on Health - Pelvic bone pain is posted by - Joey

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