Many women experience pain in the pelvic joints during or after pregnancy. Pelvic joint pain may occur because of: Changes to your posture and physique Increased pressure on your pelvis due to the growth of your baby An increase in pregnancy related hormones (relaxin) which soften the ligaments that support the pelvis These changes place increased strain on the pelvic joints, making them painful. Approximately 20% of pregnant woman experience pelvic pain du...