Many women who are pregnant experience back pain. Back pain in pregnancy usually occurs in the joints of the lumbar spine, at the sacroiliac joint (where the pelvis meets the spine), or at the pubic symphysis (the front of the pelvis). Women can experience back pain during pregnancy for several reasons, some examples include:
- Weight Gain: The weight gain women experience during pregnancy, as well as the growing fetus in the uterus can increase pressure on the back, which can lead to back pain.
- Posture Changes: As the fetus grows in your uterus, your centre of gravity shifts and most people adjust their posture to compensate for this, which can lead to muscle strain and back pain.
- Hormone Changes: Your body makes a hormone during pregnancy called relaxin, which relaxes ligaments. This is important to loosen up the pelvic joint, in order for you to be able to deliver your baby. However, other joints loosen up as well, including your back joints, which can lead to instability and pain.