The growing breasts and belly of pregnancy shift the mother's center of gravity forward and changes her posture. Due to increased loads on lumbar spine, a herniated disc may occur or get worse. When this happens, the discs outer rim ruptures and the gel inside leaks out, putting pressure on the sciatic nerve.
Posture changes may also cause the muscles in the pelvis and buttocks areas to tighten and compress the sciatic nerve. Sometimes the expanding uterus might put pressure on the sciatic nerve where it passes through the pelvis, compressing it.
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