Mainly, it's the relaxin hormone loosening your joints for birth, plus your shifting center of gravity pulling on your lower back. But honestly, I thought the pain would be higher up in the back—mine is a deep, nagging ache right in the tailbone, especially when I sit too long! My physio says it's the sacroiliac joint acting up, so now I do specific cat-cow poses and avoid cross-legged sitting, which has been a real saver.
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