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How an IUD Prevents Pregnancy

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There are 4 main ways:

  1. Preventing the release of eggs from the ovaries (hormonal IUDs only).

  2. 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.

  3. Thickening of the cervical mucus, which prevents sperm from entering the uterus.

  4. Inhibiting sperm movement so it’s more difficult to reach and fertilize an egg. 

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