Pregnancy Related Sacroliliac Joint Pain (SIJ)

The sacroiliac joints (SIJ) are located at the small dimples on your lower back, where the pelvis and sacrum meet. These strong, stable joints bear the body’s weight and allow very little movement due to the interlocking articular surfaces and the network of soft tissue structures, including core stabilizers, which create a compressive force around the SIJ.

During pregnancy, the stability of these joints can be compromised, leading to sacroiliac joint pain (SIJ pain), a common issue for many expecting mothers. The pain can occur at any point during pregnancy, with symptoms often intensifying as the pregnancy progresses.

Why Does SIJ Pain Occur During Pregnancy?

During pregnancy, the body releases a hormone called Relaxin, which helps loosen the ligaments in preparation for childbirth. While this is essential for delivery, it also reduces the stability of the pelvis. Additionally, the growing uterus stretches core muscles, weakening them and contributing to instability. Changes in posture, increased body weight, and altered walking patterns all place mechanical strain on the SIJ, leading to inflammation and pain.

Symptoms of SIJ Pain

SIJ pain often presents as a deep ache in the lower back, which may radiate into the buttocks or the front of the hip. The pain is typically worse when:

  • Standing

  • Walking

  • Climbing stairs

  • Resting on one leg

  • Getting in and out of a chair

  • Twisting or rolling over in bed

It tends to be relieved when lying down with support, which helps reduce the strain on the joint.

Duration of SIJ Pain

In many cases, SIJ pain resolves by 3 months postpartum. However, because Relaxin remains in the body for up to 3 months after stopping breastfeeding, some mothers continue to experience SIJ pain beyond this period. Without proper rehabilitation and stability exercises, the pain can persist.

Treatment for Pregnancy-Related SIJ Pain

The good news is that most cases of pregnancy-related SIJ pain can be effectively treated with physiotherapy. Core strengthening exercises help restore stability to the pelvis and relieve strain on the SIJs. In some cases, pelvic girdle belts or other supports can be used during pregnancy to provide additional stability and reduce discomfort.

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