Side effects of the non-hormonal coil

The non-hormonal coil can cause stronger or longer periods, more cramping, and temporary spotting, especially soon after insertion. The device is a copper intrauterine device, so it does not release hormones. Its effect comes from copper creating an environment that prevents pregnancy. Because it sits inside the uterus, insertion itself can cause short-lived period-like cramps or light bleeding. Side effects vary, and a clinician can check whether a symptom fits the expected adjustment period.

Cramps may be most noticeable around insertion and during menstruation. Some people notice heavier flow, longer bleeding, or spotting between periods after the coil is fitted. These changes can be troublesome if you already have painful or heavy periods. Heavy bleeding may contribute to tiredness, breathlessness, dizziness, or paleness; those symptoms can occur with iron deficiency anaemia and deserve assessment. A coil does not protect against sexually transmitted infections, and it does not cause hormonal effects such as those associated with a hormonal IUD device.

Pain or bleeding that is new, severe, worsening, or continuing outside your usual pattern should not be dismissed as a routine side effect. The coil can rarely move or come out, and infection is another reason for prompt review.

Keep a simple record of bleeding, cramps, pain-relief use, and any change in the coil threads you were shown how to check. Use only pain relief that is suitable for you and follow the label or your clinician’s advice; anti-inflammatory medicines are not appropriate for everyone. Rest, warmth over the lower abdomen, and good hydration may make cramps easier to manage. Arrange a review if bleeding is affecting daily activities, pain is not settling, or you are considering removal. Do not pull the threads or try to remove the device yourself.

If the threads feel different, cannot be felt when you previously could feel them, or you feel hard plastic at the cervix or in the vagina, use another contraceptive method and contact a clinician.

Seek urgent medical help for severe or rapidly worsening lower-abdominal pain, fainting, marked weakness, fever or chills, or heavy bleeding that makes you feel unwell. Contact a clinician promptly for persistent pelvic pain, unusual or foul-smelling discharge, pain during sex, a late period with pain or bleeding, or concern that the coil has moved. These symptoms can require examination and sometimes a pregnancy test or imaging.

Ask whether your usual period pattern makes a copper coil a suitable choice, which pain relief is safe with your medical history, and how to recognise a change in position. You can also ask how heavy bleeding will be assessed, when a check-up is needed, and what alternatives are available if cramps or bleeding remain difficult.