As the pregnancy progresses and the baby grows, the uterus, once a pea sized organ expands 1000 times its normal size. With this growth and weight increase, your back, which is the center of gravity, now shifts to support more than what it has been carrying before. As your posture changes, you lean backward and put more strain on the back muscles. If you have weak abdominal muscles, the back pain during pregnancy can be more severe.
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