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Hyperplasia · Reviewed by CION Oncologists · NABH Accredited
What Causes Endometrial Hyperplasia
Every cause of endometrial hyperplasia comes down to the same thing, which makes this easier to understand than most medical topics. The lining of the uterus grows under oestrogen and is matured and shed under progesterone. Progesterone is only produced after ovulation. So anything that means oestrogen keeps arriving while progesterone does not — cycles that skip ovulation, extra oestrogen from body fat, oestrogen taken without a progestogen — leaves the lining growing and not shedding. That is hyperplasia. Understanding it this way also explains the encouraging part: for hyperplasia without atypia, removing the stimulus and supplying progestogen frequently reverses it.
- One mechanism, several routes — oestrogen without enough progesterone
- Ovulation is the key event — no ovulation means no progesterone
- Body fat makes oestrogen too — which is why weight matters here
- Without atypia it often reverses — once the cause is addressed
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Where the Unopposed Oestrogen Comes From
Different routes to the same hormonal state. Most women have more than one of these operating.
| Cause | How it produces hyperplasia |
|---|---|
| Cycles without ovulation | The central mechanism. No ovulation means no corpus luteum, so no progesterone — while the ovary continues producing oestrogen. Common in polycystic ovary syndrome and in the years before menopause. See PCOS. |
| Body weight | Fat tissue contains an enzyme that converts other hormones into oestrogen. That source is independent of the ovaries and continues after menopause, which is why weight matters at every age here. Mechanism rather than blame. See weight and endometrial cancer. |
| The perimenopausal transition | Hormonally the most unsettled years of a woman’s life. Many cycles stop ovulating while oestrogen continues, often erratically. This is why hyperplasia is relatively common in the forties and fifties. See bleeding in perimenopause. |
| Oestrogen without a progestogen | A woman with a uterus taking oestrogen alone is a direct route to hyperplasia, which is precisely why hormone therapy for such women always includes a progestogen. See HRT and endometrial cancer. |
| Certain oestrogen-modulating treatments | Some treatments used in other conditions act on the uterine lining in an oestrogen-like way and are recognised to increase hyperplasia risk, which is why bleeding on them is always investigated. See this treatment and the endometrium. |
| Diabetes and insulin resistance | Insulin encourages the lining to proliferate through a pathway of its own, over and above the effect of weight. See diabetes and endometrial cancer. |
| An oestrogen-producing ovarian tumour | Rare, and worth naming because it is a specific findable cause. A granulosa cell tumour of the ovary produces oestrogen directly and can present through the hyperplasia it causes. |
Identifying which of these applies to you is the part that changes your outcome. Treating hyperplasia without addressing the cause invites it straight back. If nobody has asked about your cycles, your weight or your medicines, that conversation has not happened yet. See can hyperplasia come back.
Did You Know? The single most useful thing to understand is that progesterone is a consequence of ovulation, not of having periods. A woman can bleed regularly and still not be ovulating, and the bleeding in that situation is the lining breaking down because it has outgrown its blood supply rather than shedding in an orderly way. That is why irregular, unpredictable or unusually heavy bleeding is a signal worth acting on rather than tolerating — it is often the visible sign of exactly the hormonal state that produces hyperplasia. It is also why treatment is aimed at supplying what is missing rather than at removing what is there. Sources: WHO Classification of Tumours — Female Genital Tumours; RCOG/BSGE Green-top Guideline on the management of endometrial hyperplasia; NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms.
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Why the Type Matters More Than the Cause
Two diagnoses share the name hyperplasia and they are managed very differently.
- Hyperplasia without atypia. The lining is thickened and overgrown but the cells themselves look normal. The risk of progressing to cancer is low, and it frequently reverses with progestogen treatment together with attention to the cause. See hyperplasia without atypia.
- Atypical hyperplasia. The cells themselves show worrying changes. This is regarded as a precancerous condition, carries a substantially higher risk of progression, and a proportion of women already have a cancer elsewhere in the uterus that the biopsy did not reach. Hysterectomy is usually recommended. See atypical hyperplasia.
- The word on your report is the one that matters. “Without atypia”, “simple” or “benign” point to the first. “Atypical”, “atypia” or “endometrioid intraepithelial neoplasia” point to the second. Ask directly which yours says.
- The causes are the same for both. Which is why weight, cycles and hormone treatment are addressed in either case, alongside whatever treatment is chosen.
- Neither is cancer. Worth stating plainly. Hyperplasia is a change in the lining, not a malignancy, and even atypical hyperplasia is a precancer rather than a cancer. See will hyperplasia turn into cancer.
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Cycles, weight, medicines and hormones assessed together — because treating the lining alone invites it back.
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One Mechanism Explains the Whole List
Oestrogen without enough progesterone. Everything else is a route to that same state.
What Addressing the Cause Actually Looks Like
Concrete, and mostly not dramatic.
- Supplying the missing progestogen. The core of treatment, whether by a hormonal intrauterine system or by tablets. It replaces what anovulation is failing to produce and allows the lining to mature and shed. See progestin treatment.
- Restoring regular shedding. Where cycles are absent or very infrequent, the aim is to ensure the lining is shed regularly rather than left to accumulate. This is a treatable problem and one worth treating in its own right.
- Weight reduction where relevant. A modest, sustained loss reduces the oestrogen produced by fat tissue and improves insulin resistance at the same time. It is one of the few interventions that acts directly on the mechanism. See diet and exercise.
- Reviewing hormone therapy. Any woman with a uterus taking oestrogen needs a progestogen alongside it. If you are on oestrogen alone, that needs correcting rather than continuing.
- Managing diabetes properly. Insulin resistance contributes through its own pathway, so blood sugar control is relevant here and not merely general advice.
Follow-up biopsies are part of the plan rather than an optional extra — they confirm the lining has actually returned to normal rather than assuming it has. See follow-up and monitoring.
Diagnosed With Hyperplasia and Unsure Why?
Bring your report. The cause identified and a treatment plan with follow-up built in. The opinion is free.
What to Report While Being Treated
Treatment usually works. These are the things that mean it needs reviewing sooner.
Bleeding that does not settle
Progestogen treatment commonly causes irregular bleeding or spotting in the first months, particularly with a hormonal intrauterine system, and that is expected. Bleeding that is still heavy or unpredictable after several months is a reason to be reviewed rather than to keep waiting, because it may mean the lining is not responding.
Any bleeding after menopause, at any point
Whether or not you are being treated for hyperplasia, and whether or not you were told it was benign. Bleeding a year or more after your final period is always assessed. See bleeding after menopause.
Missing follow-up biopsies
The commonest practical failure in hyperplasia care. Once bleeding settles, women understandably assume the problem has resolved — but the only way to confirm the lining has returned to normal is to sample it again. Ask when yours is due and whose list you are on.
A hormonal IUD that may have moved
If you are being treated with a hormonal intrauterine system and cannot feel the threads, or have new pain or a change in bleeding pattern, it needs checking. A device that is not correctly in place is not delivering treatment. See the hormonal IUD for hyperplasia.
Hyperplasia that keeps returning
Recurrence usually means the underlying cause has not been addressed rather than that treatment failed. It is a prompt to revisit cycles, weight, medicines and hormone therapy, and occasionally to reconsider the treatment approach. See can hyperplasia come back.
Why the Cause Matters as Much as the Treatment
Treating the lining without addressing what produced it is why hyperplasia comes back.
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Bleeding Regularly Is Not the Same as Ovulating
Progesterone comes from ovulation. A woman can bleed every month and produce very little of it.
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Common questions
Causes of Hyperplasia — Frequently Asked Questions
What actually causes endometrial hyperplasia?
Prolonged stimulation of the uterine lining by oestrogen without enough progesterone to balance it. Oestrogen makes the lining grow; progesterone matures it and allows it to shed. Progesterone is produced only after ovulation, so any state involving frequent cycles without ovulation — polycystic ovary syndrome, the years before menopause — produces oestrogen without progesterone. Body fat adds oestrogen of its own by converting other hormones, independently of the ovaries. Oestrogen taken without a progestogen by a woman with a uterus does the same directly. Most women have more than one of these operating at once.
I have regular periods. How can I have hyperplasia?
Because bleeding regularly is not the same as ovulating regularly, and this catches many women out. Progesterone is produced by the structure left behind after an egg is released; if no egg is released, no progesterone is made even though oestrogen continues and bleeding may still occur. That bleeding is the lining breaking down because it has outgrown its blood supply rather than shedding in an orderly way. It is one reason irregular, unpredictable or unusually heavy bleeding is worth acting on — it is often the visible sign of exactly the hormonal state that produces hyperplasia.
Does being overweight cause hyperplasia?
It contributes, through a direct and well-understood mechanism rather than in any vague sense. Fat tissue contains an enzyme that converts circulating androgens into oestrogen, so it acts as a source of oestrogen independent of the ovaries — and it continues to do so after menopause, when the ovarian source has stopped. Obesity is also associated with insulin resistance, and insulin encourages the lining to proliferate through a separate pathway. This is why weight is relevant at every age here. A modest sustained reduction acts on both mechanisms at once and is one of the few interventions that addresses the cause directly.
Will treating the cause make the hyperplasia go away?
For hyperplasia without atypia, frequently yes — and this is the genuinely encouraging part. Supplying the missing progestogen, whether by a hormonal intrauterine system or by tablets, together with addressing the underlying stimulus, causes the lining to regress in a large proportion of women. Follow-up biopsies confirm that it has, which is why they matter and should not be skipped once bleeding settles. Atypical hyperplasia is a different situation: it is regarded as precancerous, a proportion of women already have a coexisting cancer, and hysterectomy is usually recommended rather than hormonal treatment alone.
If I have hyperplasia, will I get endometrial cancer?
Most women will not, and the type on your report is what determines the risk. Hyperplasia without atypia carries a low risk of progressing to cancer and frequently reverses with treatment. Atypical hyperplasia carries a substantially higher risk and is managed as a precancerous condition, which is precisely why it is treated more definitively. Neither is cancer in itself. What matters most is that the diagnosis is acted on: treatment given, the underlying cause addressed, and follow-up biopsies completed to confirm the lining has returned to normal rather than assumed to have done so.
Medical disclaimer: This page provides general information about the causes of endometrial hyperplasia, reviewed by a CION oncologist. It is not a substitute for individual medical advice. Management differs substantially between hyperplasia with and without atypia, and should be decided with your treating doctor on the basis of your biopsy result. Any bleeding after menopause should be assessed by a doctor.