What should you know about copper worm coil?

A copper IUD is a small device shaped to sit in the uterus. Its copper component creates a local contraceptive effect by interfering with sperm. It is placed and removed through the cervix by a trained clinician. “Worm” is not a type of contraceptive device, and a copper IUD is not intended to treat intestinal worms or another infection. It also does not prevent sexually transmitted infections. Some users have more cramping or heavier periods after insertion, while others notice little change.

Use the words copper IUD or copper coil when searching for care, and show a clinician any product image or message that led to the phrase. Discuss your health history, bleeding pattern, pregnancy possibility and preferred duration of contraception. Do not buy an unlabelled device or attempt insertion. See [Copper IUD Device](/materials/copper-iud-device/) for more detail, and compare the [Hormonal Coil](/treatments/contraception-and-family-planning/hormonal-coil/) if avoiding heavier periods is a priority to discuss.

Seek prompt advice for pelvic pain that is worsening, fever, unusual discharge, unexpected heavy bleeding or a positive pregnancy test with an IUD in place. Go to urgent care for severe pain, fainting or bleeding that causes weakness or dizziness. A missing or changed thread length also needs assessment.

Ask what the device is officially called, whether it suits your bleeding pattern and medical history, how insertion discomfort is handled, how to check the threads, and which warning signs require urgent review.