SsurebreC t1_jed1bv0 wrote
Reply to comment by LangleyHearse in eli5: Why do women only have their period/ are fertile for approximately 50 years if they’re born with millions of eggs? by MediumYoghurt3061
No but that would be such a neat idea :]
Cramps is what happens when cells that line the uterus (endometrial cells) break down. This processes releases chemicals (prostaglandins) that cause the muscles and blood vessels in the uterus to contract.
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