Hormonal pros: possible lighter periods or stopped, usually less period pain, possible stabilized hormonal levels, 99.8% effective Hormonal cons: possible unpredictable bleeding, lasts 5 years Copper pros: no negative hormonal side effects, lasts 10 years Copper cons: possible heavier bleeding and more cramps, 99.5% effective. I always recommend trying a hormonal IUD first because they have possible positive side effects.

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