First, work out which regimen you're actually on
This is the single question that decides whether your bleeding is expected, and a surprising number of women are never told the answer clearly. Look at your prescription or your pack.
- Sequential / cyclical combined HRT — you take estrogen every day, and a progestogen for part of the month (commonly around 10–14 days). It is prescribed mainly to women who are still perimenopausal or recently postmenopausal. It is built to give you a bleed.
- Continuous combined HRT — estrogen and a progestogen every day, no break. It is the "no-bleed" regimen, usually offered once you are comfortably past your last period. The goal is no bleeding.
- Estrogen-only HRT — normally only if you have had a hysterectomy, so bleeding from the womb is not part of the picture (see estrogen-only vs combined HRT).
- Vaginal estrogen (creams, pessaries, rings) — a local, low-dose treatment for dryness and urinary symptoms. It should not cause bleeding from the uterus. Any bleeding on vaginal estrogen should be reported, not shrugged off.
Sequential HRT: the bleed is the point
On sequential HRT, progestogen is given for part of the month specifically to shed and reset the endometrium — the same job your own progesterone used to do. When you stop the progestogen phase, the lining comes away. That is a withdrawal bleed. Typically it starts at or shortly after the end of the progestogen days, and it should be reasonably predictable: roughly the same timing, roughly the same volume, month after month.
What is expected on sequential HRT:
- A regular, roughly monthly bleed at the same point in the cycle each time.
- A bleed that is usually lighter and shorter than the periods you had before.
- Some settling in the first couple of months, especially if you started mid-cycle.
What is not expected, and should be reported:
- Bleeding at the wrong time — during the estrogen-only days, or before the progestogen phase ends.
- A bleed that is suddenly much heavier, much longer, or arrives with clots when it never used to.
- Bleeding after sex.
- Nothing at all for months, then a bleed out of nowhere.
Sequential HRT is not meant to be used indefinitely. After around five years, or once you are clearly postmenopausal, prescribers usually plan a move to a continuous regimen — partly because years of cyclical progestogen protects the lining less well than daily progestogen. That switch is a conversation with your prescriber, not something to do yourself.
Continuous combined HRT: why am I bleeding if it's the "no bleed" one?
Because the endometrium has to thin out first, and that takes time. Daily progestogen suppresses the lining, but on the way there it can shed unpredictably — a few days of spotting, a smear of brown, then nothing, then a week of light bleeding a month later. National guidance (NICE, and the NHS patient information on HRT side effects) treats unscheduled bleeding in the first six months of systemic HRT, or within three months of a dose or preparation change, as a common and usually self-limiting side effect.
Two practical points that women are rarely told:
- Starting continuous HRT too soon is a common reason for stubborn bleeding. If you still have ovarian activity — if your own cycle hasn't genuinely finished — daily progestogen has to compete with your own fluctuating estrogen. That is a recipe for erratic spotting. It is why prescribers usually wait until you have been period-free for around a year, or are past your early fifties, before starting a continuous regimen.
- The pattern of bleeding matters more than its presence. Settling-in bleeding tends to get lighter and less frequent month by month. Bleeding that stays the same, or gets worse, is not settling — it is telling you something.
What is the rule I should actually remember?
One rule covers almost every situation:
Bleeding in the first six months of continuous combined HRT (or within three months of a change) is common and usually settles. Bleeding that is heavy, that persists beyond six months, or that starts new after your HRT has been stable and bleed-free needs to be assessed — promptly.
That last clause is the one that saves lives. New bleeding after a settled, bleed-free stretch on continuous HRT is functionally postmenopausal bleeding, and postmenopausal bleeding is the symptom womb cancer most often announces itself with. Here is the honest arithmetic: of all women investigated for postmenopausal bleeding, roughly one in ten turns out to have endometrial cancer. Which means around nine in ten do not — the great majority have atrophy, a polyp, or an HRT-related cause. Both halves of that sentence matter. The odds are strongly in your favour, and that is precisely why the bleeding is investigated rather than assumed benign: the only way to stay in the nine is to check that you are not in the one. "It's probably just my HRT" is not a diagnosis anyone can make from the outside — not you, and not a clinician over the phone.
What causes unexpected bleeding on HRT?
| Cause | What it typically looks like | What usually happens next |
|---|---|---|
| Settling-in (endometrial adjustment) | Light, irregular spotting in the first 3–6 months of continuous HRT; gradually less each month | Watchful waiting with a review at around 3 months; the prescriber may adjust the progestogen if it persists |
| Missed doses or erratic timing | Spotting a few days after skipped or late progestogen; often traceable to a specific gap | Reviewing adherence and, if needed, a form that's easier to take consistently |
| Poor or uneven absorption | Patches that lift, peel or fall off; gel applied to too small an area, over moisturiser, or washed off too soon — estrogen levels swing | Checking technique and application site; sometimes a switch of delivery route (see pills vs patches vs gels) |
| Endometrial or cervical polyps | Spotting between bleeds, bleeding after sex; can appear at any point, not just at the start | Ultrasound and hysteroscopy; polyps are usually removed and sent to the lab |
| Fibroids or adenomyosis | Heavier or longer bleeding, sometimes with pressure or pelvic ache | Imaging; management depends on size, position and symptoms (uterine fibroids) |
| Vaginal or vulval atrophy | Light pink or brown spotting, often after sex; dryness, soreness, stinging | Examination; local treatment is separate from systemic HRT and is decided with the prescriber |
| Drug interactions | New bleeding after starting an enzyme-inducing drug (some anti-epileptics, rifampicin, St John's wort) that lowers estrogen levels, or an anticoagulant that makes any bleeding heavier | Medication review — bring every tablet and supplement, including herbal ones |
| Infection or cervical cause | Bleeding with discharge, odour, pain, or bleeding after sex | Swabs, speculum examination, cervical screening if due |
| Endometrial hyperplasia | Persistent or heavy unscheduled bleeding; more likely if progestogen cover has been inadequate | Biopsy; treatable, and treating it is how cancer gets prevented |
| Endometrial (womb) cancer | Uncommon in this group, but any postmenopausal or persistent unscheduled bleeding can be its first sign | Urgent assessment with tissue sampling; caught early it is highly treatable |
What will the investigation actually involve?
Usually: a conversation about your exact regimen and how consistently you take it, a pelvic and speculum examination, a transvaginal ultrasound scan, and — increasingly — a sample of the lining taken in clinic (an endometrial biopsy: brief, crampy, over quickly). If the scan or biopsy raises questions, a hysteroscopy lets the gynaecologist look inside the uterus with a fine camera and remove a polyp in the same appointment.
Two things are worth knowing before you go. First, there is no screening programme for womb cancer. Cervical screening — the smear or Pap test — samples cells from the cervix and is not designed to find endometrial cancer; a normal smear tells you nothing about your womb lining. Bleeding is the signal. Reporting it is what triggers the test.
Second, a "normal" or thin ultrasound does not always close the question. The old approach — measure the lining, and if it is thin, stop there — has been revised. In April 2026 ACOG published updated guidance on the evaluation of postmenopausal bleeding, concluding that ultrasound alone misses a meaningful proportion of cancers and that most patients should have endometrial sampling as well as a scan, with ultrasound-only triage reserved for a narrow group. On HRT specifically, the lining measurement is harder to interpret than in women taking nothing at all. So if you were scanned, told it was fine, and you are still bleeding — go back. Persistent bleeding after a reassuring scan is a reason for further investigation, not a reason for reassurance.
Why this gets dismissed — and how to make sure yours isn't
"It's just your HRT bedding in" is true most of the time, which is exactly why it gets said reflexively — including at month nine, when it has stopped being true. If you feel your bleeding is being waved away, be concrete rather than apologetic. Take three things to the appointment:
- A bleeding diary. Dates, how many days, how heavy (pad or tampon changes per day, any clots, any flooding), and whether it followed sex. Patterns persuade in a way that "I've been spotting a bit" does not.
- Your exact regimen, in writing — the estrogen product and route, the progestogen, which days you take it, and honestly, how many doses you have missed. Our menopause doctor report builds this into a one-page summary you can hand over.
- The specific question: "This bleeding started [X] months after I began HRT and it isn't settling. What is your plan to rule out an endometrial cause?" That sentence is much harder to defer than "is this normal?" More phrasing in questions to ask your doctor about HRT.
When to see a doctor
Contact your GP, prescriber or menopause clinic — do not wait and see — if any of these apply.
- You are on continuous combined HRT and bleeding starts again after six months or more of no bleeding.
- Unscheduled bleeding or spotting is still happening after six months on continuous HRT, or more than three months after a dose or product change.
- Bleeding is heavy — soaking through a pad or tampon in an hour or two, passing clots, or flooding.
- You are on sequential HRT and your bleed has changed: heavier, longer, at the wrong time in the month, or it has stopped being predictable.
- You bleed after sex, at any age, on any regimen.
- You have bleeding on vaginal estrogen only, which is not expected to cause uterine bleeding.
- Bleeding comes with pelvic pain, a watery or blood-stained discharge, unexplained weight loss, bloating that doesn't settle, or a change in bowel or bladder habits.
- You are postmenopausal and not on HRT at all and you bleed. Any bleeding after menopause needs to be assessed — always, however light, however brief, and however easily you can explain it away.
Get same-day or emergency care if the bleeding is torrential — soaking a pad an hour for more than a couple of hours — or you feel faint, breathless or lightheaded with it.
Do not stop, lower or change your HRT dose yourself to see whether the bleeding settles. It is the most understandable instinct in the world and it works against you twice: it muddies the picture your clinician needs to interpret, and it can delay the assessment that actually answers the question. Keep taking what you have been prescribed, write the bleeding down, and tell the person who prescribed it. Any change to the regimen is a decision they make with you.
The bottom line
Bleeding on HRT is not one thing. On a sequential regimen a monthly bleed is the design, and it should be predictable. On continuous combined HRT the aim is no bleeding, and the first three to six months of spotting are the price of getting there — genuinely common, genuinely usually temporary. Beyond that window, or after a settled bleed-free stretch, bleeding stops being a side effect and becomes a symptom. The odds are still overwhelmingly in your favour. The point of getting it checked is to keep them that way.
More on regimens and how they are chosen in our guide to hormone replacement therapy, and on the wider picture in the menopause hub.
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