Your questions

Is irregular bleeding on HRT normal?

Unscheduled bleeding is a common side effect in the first few months of starting HRT, or within a few months of changing the dose or type, and NICE NG23 says to mention it at your review. It needs prompt assessment, though, if it continues beyond the first six months, starts after a settled spell of no bleeding, or is heavy or persistent. Do not stop HRT on your own. This is information, not medical advice.

Early bleeding is often expected

NICE guideline NG23 explains that unscheduled vaginal bleeding is a common side effect in the first few months of starting systemic HRT, or within a few months of changing the dose or preparation, and that people are usually asked about it at the three-month review (nice.org.uk/guidance/ng23/chapter/Recommendations). The lining of the womb takes time to settle into a new pattern, which can show up as spotting or bleeding. That early bleeding is often part of the picture rather than a sign something is wrong, but it is still worth telling your clinician.

When bleeding needs to be checked

NICE NG23 (recommendation 1.8.4) says unscheduled vaginal bleeding is common during the first six months of starting systemic HRT, or within three months of changing the dose or preparation, and advises seeking medical help promptly if it continues beyond those windows. Bleeding that begins after a settled period of no bleeding, or that is new, heavy or persistent, should be assessed, and NG23 links to the unscheduled-bleeding and endometrial-cancer sections of NICE NG12 so the lining of the womb can be checked where appropriate. Getting it looked at is a precaution, and most causes turn out to be benign.

Why HRT can cause bleeding

HRT changes the hormone signals reaching the lining of the womb, and the pattern of bleeding depends on the type. Sequential regimens are designed to produce a regular monthly bleed, while continuous combined regimens aim for no bleeding once settled, though spotting is common at first. Because the expected pattern differs by regimen, your prescriber is best placed to say what is normal for you. You can read more about prescribing patterns on our HRT prescribing tracker.

What to do

Do not stop or change your HRT on your own because of bleeding. Speak to your GP, prescriber or pharmacist, who can tell you whether the bleeding fits the expected early pattern or needs assessment, and advise on any adjustment. If bleeding is heavy or you feel unwell, seek advice sooner.

Sources

Frequently asked questions

Is bleeding on HRT normal in the first few months?

Often, yes. NICE guideline NG23 explains that unscheduled vaginal bleeding is a common side effect in the first few months of starting systemic HRT, or within a few months of changing the dose or type. People are usually asked about it at the three-month review. It is still worth raising rather than ignoring, so a clinician knows what is happening.

When should bleeding on HRT be checked?

NICE advises seeking medical help promptly if unscheduled bleeding continues beyond the first six months of starting HRT, starts after a settled period of no bleeding, or carries on beyond about three months after a change of dose or preparation. Bleeding that is new, heavy or persistent should be assessed, and guidance links to the suspected cancer pathway for further checks where needed.

Why does HRT cause bleeding?

HRT changes the hormones acting on the lining of the womb, and the lining can take time to settle into a new pattern, which can cause spotting or bleeding early on or after a change. The exact pattern depends on the type of HRT, for example sequential versus continuous combined. Your prescriber can explain what to expect with your particular regimen.

Should I stop HRT if I have bleeding?

Do not stop or change HRT on your own because of bleeding. Speak to your GP, prescriber or pharmacist first. They can tell you whether the bleeding fits the expected early pattern or needs assessment, and advise on any change. This page is general information, not advice about your own treatment.

Last reviewed June 2026. This is general information, not medical advice, and is not a substitute for a registered clinician. If you have unscheduled or heavy bleeding on HRT, speak to your GP or prescriber. Return to the questions hub.

OM

Oliver Mackman

Editor, Her Vitals

Oliver leads Her Vitals's editorial coverage of women's life-stage health and supplements. He curates and reviews existing branded products across trying to conceive, pregnancy, postnatal, perimenopause, menopause and the senior years, weighing what the evidence supports against guidance from bodies such as EFSA, the NHS and NICE, and is clear that the content is information rather than medical advice.

Last reviewed: 29 June 2026