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The Hormone IUD — A Treatment, Not Just Contraception

Most women know the hormone coil as contraception, which makes it a surprising thing to be offered for a precancerous condition. The reframing is worth making explicitly. Here it is being used as a drug delivery device: it sits inside the cavity and releases a progestin directly onto the tissue that needs treating. That gives a very high concentration exactly where it is required, with far less hormone reaching the rest of your body than tablets would, and it does not depend on remembering anything. Those three properties are why current guidance recommends it as first-line treatment for hyperplasia — and the contraception is incidental.

  • It delivers treatment to the lining — high local dose, low systemic exposure
  • Guidance recommends it first — higher regression rates than tablets in direct comparison
  • Fitted in a clinic in minutes — no general anaesthetic in most cases
  • Expulsion is silent — which is why position gets checked if bleeding changes
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What It Is Doing In There

The device is a small T-shaped frame carrying a reservoir of progestin, which it releases slowly and continuously over several years. Inside the uterus, that produces a specific and sustained effect on the lining.

  • It stops the glands proliferating. Progestin binds receptors in the endometrial tissue and halts the growth that oestrogen has been driving — supplying the brake that was missing.
  • It thins what is already there. Over months the overgrown lining matures and then progressively shrinks, so a crowded, irregular endometrium can return to a thin quiet state. This is reversal, not merely suppression.
  • It works continuously. No peaks and troughs, no missed doses, no gaps. For a condition caused by sustained unopposed oestrogen, sustained opposition is exactly the right shape of treatment.
  • It keeps working for years. Which matters because treatment here often continues well beyond the point at which the lining first clears, particularly where the underlying cause has not changed.

For the wider picture of how progestin treatment works and how success is measured, see progestin therapy for endometrial hyperplasia.

Did You Know? The reason a device beats tablets here is a matter of geography rather than of a stronger drug. Progestin taken by mouth is absorbed into the bloodstream and distributed around the entire body, so the amount reaching the endometrium is a fraction of the dose, and everything else — brain, breast, liver — receives it too, which is where the side effects come from. A device sitting in the cavity releases progestin millimetres from the tissue that needs it. The local concentration in the endometrium is far higher than tablets could achieve, while the amount reaching the rest of you is far lower. Better treatment and fewer side effects, from the same class of hormone, purely because of where it is released. Sources: RCOG / BSGE Green-top Guideline No. 67 on the management of endometrial hyperplasia; NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma.
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Who It Is Used For

The same device is used in several situations, with different intent in each.

SituationRole of the device
Hyperplasia without atypia First-line treatment. Expected to clear the lining in most women, with repeat sampling to confirm. See hyperplasia without atypia.
Atypical hyperplasia, wanting to conceive Part of fertility-sparing treatment, delivering high-dose progestin while the uterus is preserved — conditional on intensive surveillance biopsies. See atypical hyperplasia.
Atypical hyperplasia, surgery unsafe The accepted alternative where an operation would carry genuine risk, again with close surveillance rather than as a simple substitute.
Preventing hyperplasia in PCOS Where cycles are infrequent, the device supplies continuous progestogen and protects the lining from years of unopposed oestrogen. See PCOS and endometrial cancer.
As the progestogen part of HRT In a woman with a uterus taking oestrogen replacement, the device can supply the required endometrial protection. See oestrogen-only HRT.
Heavy periods generally Its more familiar use. Relevant here because heavy bleeding is often how hyperplasia presents, so the same device may be treating both the symptom and the cause.

Where it is not suitable: a cavity substantially distorted by fibroids, current pelvic infection, or a woman who has considered it and would rather not. Cancer of the endometrium is treated by other means, not by a device. If a device has been fitted and bleeding is not settling, that warrants reassessment rather than patience.

Worried About Having It Fitted?

It takes a few minutes, and there are practical things that make it easier — including doing it under anaesthetic if that is right for you.

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A Few Minutes in a Clinic, and the Treatment Runs Itself

Which is the whole advantage — no doses to remember, and the hormone delivered exactly where it is needed.

The practical detail

Having It Fitted, Honestly

Fitting is the part women worry about most, and the part least well described. Here is what actually happens and what makes it easier.

Before the appointment

Most units suggest taking simple pain relief an hour or so beforehand, and eating normally — going in on an empty stomach makes feeling faint more likely rather than less. Tell the team in advance if you have never had a vaginal delivery, if you have had a difficult examination before, if you have had cervical surgery, or if you are simply very anxious. Those are all recognised reasons the cervix may be harder to negotiate or the procedure more uncomfortable, and knowing in advance changes what they do — including using a smaller instrument or offering local anaesthetic to the cervix.

The fitting itself

You lie as for a smear test. A speculum is inserted and the cervix cleaned. The depth and direction of the uterine cavity are measured with a fine sound, which is usually the most uncomfortable moment, and then the device is passed through the cervical canal and released inside the cavity. The threads are trimmed so they sit in the upper vagina. From speculum to finish is a few minutes. Many women describe it as strong period cramping for a minute or two rather than sharp pain, though this varies genuinely and unpredictably between women.

If it is too painful

Say so, and say so during rather than afterwards. The procedure can be paused or stopped, local anaesthetic can be applied to the cervix, and it can be rearranged under general anaesthetic — which is a normal outcome rather than a failure, and is often combined with hysteroscopy so that the cavity is inspected at the same time. Women with a stenosed cervix, particularly after the menopause, are frequently better served by the asleep option from the outset. There is no prize for enduring it.

The first days and weeks

Cramping for a day or two is usual and responds to simple pain relief. Some spotting is expected. You will usually be advised to avoid tampons for a short period and told how to check the threads, though whether you do so is a matter of preference. Report severe or worsening pain, fever, or offensive discharge — infection after fitting is uncommon but treatable, and the first weeks are when it would show. Otherwise normal activity resumes immediately.

The first three to six months

Unpredictable spotting and light bleeding are expected while the lining settles, and this is the phase that causes most women to consider abandoning treatment. It is not a sign of failure — it is the lining being remodelled. It usually settles, and many women end up with very light periods or none at all, which is a welcome side effect when heavy bleeding was the original problem. Bleeding that is heavy rather than spotting, or that restarts after having settled, is a different matter and should be reported.

How long it stays in

Longer than most women expect, and for a specific reason. If the device is removed as soon as the lining clears, and nothing has changed about the weight, the anovulation or the oestrogen exposure that caused the hyperplasia, the endometrium is returned to precisely the conditions that produced it. Guidance therefore supports keeping the device in place for a prolonged period after regression in women who remain at risk. It also needs replacing on schedule — an expired device stops delivering, silently. See can hyperplasia come back.

Have a Device Fitted and Not Sure If It Is Still Working?

Position and expiry are both quick to check, and worth checking if your bleeding pattern has changed. The opinion is free.

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The One Problem That Happens Silently

Everything else on this page announces itself. This one does not, and it is the reason a device is checked when a bleeding pattern changes.

Expulsion

A hormone-releasing device can be partly or completely expelled, most often in the first months and sometimes without being noticed at all. If treatment is being delivered by a device that is no longer correctly placed, the lining is effectively untreated while you, and everyone caring for you, believe it is being treated. Unusually heavy bleeding, new cramping, or threads that feel longer, shorter or absent are all reasons to have the position checked — and it is a quick check.

An expired device

Devices have a licensed lifespan and stop delivering an effective dose once past it. Over several years of follow-up it is genuinely easy to lose track, particularly if care has passed between clinicians. Nothing on a medication list would flag it. If you cannot remember when yours was fitted, that is worth establishing rather than assuming.

Bleeding that returns after settling

The most useful signal on this page. Early irregular spotting is expected; bleeding that stops for months and then comes back is a different pattern and should be assessed rather than absorbed into the general expectation of irregularity. It does not usually mean anything serious, and it is the change that most reliably indicates the lining needs looking at again.

A missed surveillance biopsy

Not a device problem but the same category of silent failure. The repeat sampling is what proves the treatment worked, and it is most often missed by women who feel entirely well because their bleeding settled months earlier. Rebooking is straightforward; the gap is what causes problems. See follow-up and monitoring.

Why This Should Be Fitted Where the Follow-Up Happens

The device is the easy part. Confirming it worked, and replacing it on time, is what needs a plan.

Scan and biopsy in one visit

Transvaginal ultrasound and outpatient endometrial biopsy done in the same appointment, so the diagnostic question is settled in days, not weeks.

Follow-up you can actually keep

A written schedule of what happens when, across 35+ centres, so surveillance does not depend on remembering to chase an appointment.

45-minute consultations

Long enough to go through the scan, the report and the options properly — with a woman doctor available on request at every location.

Fertility taken seriously

For younger women who want to conceive, fertility-sparing treatment with intensive surveillance is a recognised path — and one we discuss properly before proposing surgery.

Survivorship care that is actually offered

Menopause management, lymphoedema care, sexual health, nutrition and psycho-oncology are part of the plan, not an afterthought once treatment ends.

Decisions for healing, not billing

No unnecessary tests, and no treatment proposed that the tumour board has not agreed is the right one for your stage and grade.

Take The Next Step

Ask for Pain Relief Before, Not Bravery During

Fitting is easier when it is planned for, and there is no prize for enduring it.

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Common questions

The Hormone IUD for Hyperplasia — Frequently Asked Questions

Why am I being offered a contraceptive device for a precancerous condition?

Because in this context it is not being used as contraception — it is being used as a drug delivery device. The coil releases a progestin, which is the class of hormone that opposes oestrogen's effect on the lining of the womb and is the mainstay of medical treatment for endometrial hyperplasia. Placing it inside the uterine cavity means the endometrium receives a very high local concentration while much less hormone reaches the rest of your body than tablets would deliver, and it works continuously without depending on you remembering anything. Those properties are why current guidance recommends it as first-line treatment. The contraceptive effect is incidental.

Does having it fitted hurt?

It varies genuinely and unpredictably between women, and it is worth being honest rather than reassuring. Most describe strong period-type cramping for a minute or two, with the most uncomfortable moment being when the depth of the cavity is measured. For a minority it is considerably more painful, and that is not a failure of tolerance — it is more likely if you have never had a vaginal delivery, if you are postmenopausal, or if the cervix is narrowed. Taking simple pain relief an hour beforehand helps, local anaesthetic can be applied to the cervix, and fitting under general anaesthetic is a legitimate option that is often combined with hysteroscopy.

How long does the device stay in?

Longer than most women expect, and for a specific reason. Treatment does not end when the lining first clears on a repeat biopsy — if the device is removed at that point and nothing has changed about the excess weight, the anovulatory cycles or the unopposed oestrogen that caused the hyperplasia, the endometrium is being returned to exactly the conditions that produced it. Guidance therefore supports keeping a device in place for a prolonged period after regression in women who remain at risk. The device also has a licensed lifespan and needs replacing on schedule, because an expired device stops delivering an effective dose.

How would I know if the device stopped working?

This is the important question, because the commonest failure is silent. A device can be partly or completely expelled — most often in the first months — sometimes without being noticed, and if that happens the lining is effectively untreated while everyone believes it is being treated. The signals worth acting on are bleeding that becomes unusually heavy, new cramping, or threads that feel longer, shorter or absent. Bleeding that returns after having settled for months is the most useful signal of all. Any of these warrants having the position checked, which is quick. Separately, if you cannot remember when yours was fitted, establish that rather than assuming.

Will I still need biopsies while the device is in?

Yes, and they are the whole point of the plan. The device is the treatment; the repeat endometrial sampling is what establishes whether the treatment has worked. Bleeding usually settles within a few months, long before the histology is confirmed normal, and treatment success is judged on tissue rather than on symptoms. Guidance recommends continuing sampling until consecutive normal results are obtained, typically across the first year. The device does not need removing to take a sample — the fine tube passes alongside it. Missing these appointments is the commonest way hyperplasia care quietly fails.

Medical disclaimer: This page describes the use of a hormone-releasing intrauterine system in the treatment of endometrial hyperplasia and is reviewed by a CION oncologist, following RCOG/BSGE Green-top Guideline No. 67 and current NCCN guidance. It describes treatment by hormone class rather than naming individual products. It is not advice about your own treatment. If your bleeding pattern changes after a device has been fitted, or you are unsure when yours was placed, contact the clinician managing your care.

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