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How an IUD Prevents Pregnancy
There are 4 main ways:
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Preventing the release of eggs from the ovaries (hormonal IUDs only).
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Making the lining of the uterus that builds up before your period thinner, which makes it less likely for an egg to attach to the uterus.
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Thickening of the cervical mucus, which prevents sperm from entering the uterus.
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Inhibiting sperm movement so it’s more difficult to reach and fertilize an egg.
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