What should you know about copper coil refrigeration?

Copper on the device creates a local environment that interferes with sperm movement and fertilisation. The action is chemical and local, not cooling. The device remains inside the womb, while its threads extend through the cervix so a clinician can check or remove it. It does not release hormones, protect against sexually transmitted infections or affect the temperature of your body.

Arrange fitting with a trained healthcare professional and share your menstrual, pregnancy and pelvic health history. Cramping and light bleeding can occur after the appointment. Follow advice about thread checks and review, and use backup contraception if the device may have come out or shifted. If you prefer hormone-based contraception or want help with heavy periods, ask about a [Hormonal Coil](/treatments/contraception-and-family-planning/hormonal-coil/).

Get prompt medical advice for fever, worsening pelvic pain, unusual-smelling discharge, heavy bleeding, a late period with pain or threads that cannot be felt as expected. Seek urgent help for severe pain, fainting or heavy bleeding. A clinician may need to check for infection, pregnancy or a device-position problem.

Ask how the device prevents pregnancy without hormones, what discomfort is expected, when protection starts, how to check the threads and what to do if they change. The [Copper IUD Device](/materials/copper-iud-device/) guide covers the device material and design.