LangleyHearse t1_jecztmg wrote on March 31, 2023 at 2:47 AM

Reply to comment by SsurebreC 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

So cramps are actually monthly tournaments with egg on egg combat to determine who's the strongest?

SsurebreC t1_jed1bv0 wrote on March 31, 2023 at 3:00 AM

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.