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Symptoms Explained · Reviewed by CION Oncologists · NABH Accredited
Abnormal Bleeding in Perimenopause — What Is Actually Normal?
Perimenopause is the one stage of life where erratic bleeding is genuinely expected, and that creates a particular trap. Because irregularity is normal here, women in their late forties are routinely told to wait it out — including the ones who should not be. The biology explains both halves. Ovulation becomes intermittent, so progesterone stops arriving reliably, and the lining grows unopposed and sheds unpredictably. That produces the irregular bleeding of a normal transition, and it is also the exact mechanism by which the lining overgrows. Same cause, two different outcomes.
- Irregular cycles are expected — shorter, longer, skipped, heavier — all part of a normal transition
- The mechanism cuts both ways — unopposed oestrogen causes both normal irregularity and hyperplasia
- Over 45 changes the threshold — heavy or persistently irregular bleeding warrants checking the lining
- “It is just your age” is not an assessment — it may well be true, and it should be established
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What Is Expected, and What Is Not
Both columns describe women in their forties and early fifties. The left is the transition doing what it does; the right is worth an appointment.
| Expected in perimenopause | Worth investigating | |
|---|---|---|
| Cycle length | Shortening at first, then lengthening. Cycles varying by a week or more from one to the next. Skipped periods, then a return. | Bleeding more often than every three weeks on a persistent basis, or cycles so erratic there is no discernible pattern at all over several months. |
| Volume | Some periods lighter, some heavier than you are used to. Variation between cycles. | Bleeding heavy enough to soak through hourly, pass large clots, or cause iron deficiency. See heavy or prolonged periods. |
| Duration | Periods a little shorter or longer than your previous norm. | Bleeding beyond seven days, or periods that run into each other with no clear gap between them. |
| Between periods | Occasional light spotting, particularly around a skipped or delayed cycle. | A repeated pattern of bleeding between periods, or bleeding after intercourse. See bleeding between periods. |
| After a gap | A period returning after two or three months without one, which is common in the later transition. | Any bleeding after twelve consecutive months without a period. That is postmenopausal bleeding, not perimenopause. See postmenopausal bleeding. |
The twelve-month line is the one that matters most. Once you have gone a full year without a period, you are postmenopausal, and any bleeding after that point is assessed urgently rather than as part of the transition. Women often miscount this, particularly after a long gap followed by a bleed. If you are unsure whether you have crossed it, that is worth working out with a doctor rather than assuming.
Did You Know? The reason perimenopause is a risk window rather than merely a messy one is worth understanding. In a normal ovulatory cycle, oestrogen builds the lining in the first half and progesterone matures and stabilises it in the second. During the transition, cycles increasingly pass without an egg being released — and no ovulation means no progesterone. Oestrogen continues to be produced, sometimes at high levels, with nothing opposing it. Repeated over months and years, that is exactly the hormonal state that produces endometrial hyperplasia. The irregular bleeding of perimenopause and the overgrowth that can follow it are not two different problems; they are the same physiology. Sources: NICE guideline NG23 on menopause and NG88 on heavy menstrual bleeding; FIGO classification of causes of abnormal uterine bleeding (PALM–COEIN); NCCN Clinical Practice Guidelines in Oncology — Uterine Neoplasms.
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When the Lining Should Be Checked
Guidance is reasonably clear on this, and it is worth knowing so that you can ask for it rather than hope it is offered.
- You are over 45 with heavy or persistently irregular bleeding. This is the practical threshold in most guidance for assessing the endometrium rather than treating the bleeding alone. Not because cancer is likely at 46, but because this is the age at which anovulatory cycles and endometrial overgrowth converge.
- You have obesity, type 2 diabetes or PCOS. These raise endometrial risk substantially and lower the age at which assessment is warranted. Regionally this matters: the metabolic disease burden across Telangana and Andhra Pradesh is high. See metabolic syndrome and endometrial cancer.
- Treatment has not worked. Bleeding that persists or recurs despite adequate hormonal treatment is a recognised trigger for assessing the lining, and it is the point at which a great deal of delay accumulates.
- There is a family pattern of bowel, womb or ovarian cancer. Particularly at younger ages, this may indicate Lynch syndrome, which raises endometrial risk considerably and presents earlier. See family history.
What assessment involves is short: blood tests, a transvaginal ultrasound, and an outpatient sample of the lining where indicated — a few minutes, no anaesthetic. See endometrial biopsy.
Told It Is Just Your Age?
It may well be. Establishing that takes one appointment, an ultrasound and — where it is warranted — a few minutes for a sample.
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Expected Is Not the Same as Unexamined
Most perimenopausal bleeding is exactly what it looks like. Confirming that is quick, and it is the point of asking.
What Else Causes Bleeding at This Age
The transition itself explains most of it. These are the other common answers, and several of them are readily treatable.
Very common
Fibroids
Benign muscular growths, extremely common in the forties, and a leading cause of heavy bleeding. Often coexist with perimenopausal irregularity rather than replacing it as an explanation.
Common
Adenomyosis
Lining tissue growing into the muscle wall, causing heavy and painful periods with a bulky, tender uterus. Frequently missed for years and dismissed as normal ageing.
Common
Endometrial Polyps
Benign growths that bleed unpredictably. Easily seen on ultrasound or hysteroscopy and usually removed. See polyp versus cancer.
Easily tested
Thyroid Problems
An underactive thyroid causes heavy periods and fatigue that is easily attributed to the menopause. A simple blood test, and treatable.
Precursor
Endometrial Hyperplasia
The overgrowth that unopposed oestrogen produces. Not cancer, and treatable with hormones. See endometrial hyperplasia.
Uncommon
Endometrial Cancer
Uncommon before the menopause but not rare in the late forties and fifties, and the reason the pathway exists. See do I have endometrial cancer.
Bleeding Heavily Through Your Forties and Just Managing It?
There is usually a cause and usually a treatment. Both are worth establishing. The opinion is free.
What Can Be Done About It
One point worth making clearly: investigating perimenopausal bleeding and treating it are not alternatives. You can and usually should do both.
Once the cause is established, there is a good deal available — and living with disruptive bleeding for years because it is “normal for your age” is not something you have to accept.
- A hormone-releasing intrauterine device. Frequently the single most effective option. It reduces bleeding substantially in most women, and — relevant here — it delivers progestogen directly to the lining, which addresses the unopposed oestrogen problem at the same time.
- Cyclical progestogen. Restores the missing second half of the cycle, regularising bleeding and protecting the lining. Useful where a device is unsuitable.
- Non-hormonal medication. Treatments that reduce menstrual loss without affecting hormones, taken only during the period. Effective for volume, though they do not address irregularity.
- Treating what was found. Removing a polyp, addressing fibroids, correcting thyroid function, or treating hyperplasia where that is the finding. See how hyperplasia is treated.
- Correcting the iron. Iron deficiency from years of heavy bleeding is extremely common and treating it transforms how women feel. It is not a substitute for finding the cause, and both should happen.
Why This Age Group Gets Overlooked
Everything is attributable to the menopause at 48, which is exactly why the things that are not get missed.
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Common questions
Perimenopausal Bleeding — Frequently Asked Questions
What bleeding is normal in perimenopause?
A good deal of variation is expected. Cycles typically shorten first and then lengthen, varying by a week or more from one to the next; periods may be lighter or heavier than you are used to; and skipped periods followed by a return are common in the later transition. Occasional light spotting around a delayed cycle is also unremarkable. What falls outside the expected pattern is bleeding heavy enough to soak through hourly or cause iron deficiency, bleeding lasting beyond seven days, periods running into one another with no clear gap, a repeated pattern of bleeding between periods, bleeding after intercourse, or any bleeding after a full twelve months without a period.
Why does perimenopause cause irregular bleeding?
Because ovulation becomes intermittent. In a normal cycle, oestrogen builds the lining in the first half and progesterone — produced only after an egg is released — matures and stabilises it in the second, leading to an organised shed. During the transition, more and more cycles pass without ovulation, so no progesterone follows. Oestrogen continues to be produced, sometimes at high levels, with nothing opposing it, and the lining grows and sheds unpredictably. This is why perimenopausal bleeding is erratic. It is also, importantly, the same hormonal state that produces endometrial hyperplasia when it continues over months and years.
At what age should perimenopausal bleeding be investigated?
Most guidance uses 45 as the practical threshold for assessing the uterine lining in a woman with heavy or persistently irregular bleeding, rather than treating the bleeding alone. That is not because cancer becomes likely at 45 — it does not — but because this is the age at which anovulatory cycles and endometrial overgrowth start to converge. The threshold drops below 45 if you have obesity, type 2 diabetes or polycystic ovary syndrome, all of which raise endometrial risk substantially, or if there is a family pattern of bowel, womb or ovarian cancer. It also drops if bleeding persists despite adequate treatment.
I have gone months without a period and then bled. Is that perimenopause or something else?
It depends on how long the gap was, and this is the distinction that matters most. Gaps of two or three months followed by a period are common in the later transition and are part of the expected pattern. But once you have gone twelve consecutive months without any period, you are postmenopausal, and any bleeding after that point is postmenopausal bleeding — which is assessed urgently rather than as part of the transition. Women frequently miscount this, particularly after a long gap. If you are not sure which side of the twelve-month line you are on, work it out with a doctor rather than assuming, because the pathway is different.
Can I be treated for the bleeding while it is being investigated?
Yes, and you generally should be — investigating and treating are not alternatives. Once serious causes have been excluded or while assessment is underway, there is a good deal available. A hormone-releasing intrauterine device is often the single most effective option, because it reduces bleeding substantially and simultaneously delivers progestogen directly to the lining, addressing the unopposed oestrogen problem. Cyclical progestogen restores the missing second half of the cycle. Non-hormonal medication taken during the period reduces volume. Iron deficiency from years of heavy loss is extremely common and treating it makes a large difference to how you feel.
Medical disclaimer: This page explains bleeding during the menopausal transition in general terms and is reviewed by a CION oncologist, following NICE guidance on menopause and on heavy menstrual bleeding, and current NCCN guidance. Most perimenopausal bleeding is not caused by cancer. It is general health information rather than advice about your own case. Any bleeding occurring after twelve consecutive months without a period should be assessed promptly.