What should you know about copper coil plumbing?

The womb is part of the reproductive system, separate from the bladder and bowel. The coil rests in the womb with fine threads passing through the cervix into the vagina. Copper released from the device affects sperm movement and fertilisation. It does not travel through the body, block a tube, or change urine flow. Period cramps or altered bleeding can happen after fitting because the womb may react to the device.

A trained clinician examines you, passes the device through the cervix and trims the threads. You may feel pressure or cramping during and after the procedure. Follow the fitting advice, keep any planned review, and ask how to check the threads without pulling them. If you want a different approach, compare this device with a [Hormonal Coil](/treatments/contraception-and-family-planning/hormonal-coil/).

Seek prompt medical advice for worsening pelvic pain, fever, unusual-smelling discharge, heavy bleeding, a missing period with pain, or threads that suddenly feel different. Get urgent help for severe pain, fainting or heavy bleeding. A clinician can check for infection, pregnancy or a change in position rather than relying on the feeling alone.

Ask where the coil will sit, what sensations are expected, whether your medical history affects fitting, and how to respond if the threads cannot be felt. You can read about the materials in the [Copper IUD Device](/materials/copper-iud-device/) guide.