Your cervix dilates from a pinhole to 10 centimeters—100× its resting size.

Body & Brain (@BodyBrain)

This isn't just stretching; the cervix actually undergoes tissue remodeling where collagen breaks down and realigns. The pain comes from multiple sources: uterine muscle contractions (60-90 mmHg pressure), stretching of the cervix and pelvic ligaments, and pressure on nerves. It's among the highest pain levels humans experience outside of severe injury or torture.

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