During a woman’s childbearing year, and especially during pregnancy, the hormones relaxin, estrogen, and progesterone are released into the body causing changes in the ligaments and cartilage to prepare the body for delivery. Changes include widening of the pelvis that cause changes to the SI joints with an increase in joint play, which serves the purpose of preparing the pelvis for widening during childbirth. Relaxin causes the ligaments surrounding the SI joint to become more lax, which in turn allows for greater movement of the SI joint. While this movement is important for widening the birth canal, if the movement becomes too great (hypermobile), the joint becomes very unstable during everyday activities resulting in low back pain near the base of the spine. Back pain is a very common complaint in the later months of pregnancy for some women. Coupled with postural changes that occur during pregnancy, the pain cane become totally disabling for some women during the latter part of their pregnancies.