Why Do We Get Cramps When We Have Periods?

When your body has a period, muscles in the uterus squeeze and relax. This helps push out old tissue from inside the womb, but it also causes pain. It's like when you're trying to open a tight jar of jam: you twist really hard, and that hurts.

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Examples

Cramps feel like someone is twisting your insides with a rope.
It's as if you're having tiny muscle spasms in your lower belly every month.
Sometimes the pain feels so bad it's hard to focus on anything else.

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Categories: Science · biology,health,reproduction