Starting hormone replacement therapy can be life-changing for menopause symptoms, but unexpected bleeding or spotting is one side effect that can understandably cause concern.

The reassuring news is that unscheduled bleeding is relatively common during the first months of systemic HRT and does not automatically mean that something is wrong.

However, there are circumstances where bleeding should be assessed rather than simply attributed to HRT.

This area of menopause care has received renewed attention in 2026. NICE updated its menopause guideline in April to clarify when women taking systemic HRT should seek medical help for unscheduled bleeding, while British Menopause Society guidance reviewed in May 2026 provides a detailed pathway for assessment and investigation [1][2].

Understanding what may be expected and what needs checking can help women feel informed without either ignoring important symptoms or becoming unnecessarily alarmed.

What Is Unscheduled Bleeding on HRT?

Unscheduled bleeding means vaginal bleeding that occurs outside the pattern expected from your particular HRT regimen.

What counts as expected therefore depends partly on which type of HRT you take.

Two common approaches are:

Sequential HRT

Oestrogen is taken continuously, with a progestogen added for part of each month.

A withdrawal bleed is usually expected at the end of the progestogen phase.

Continuous combined HRT

Oestrogen and progestogen are taken continuously.

The aim is usually to become bleed-free, although irregular spotting or bleeding is relatively common during the first few months.

Why Can HRT Cause Bleeding?

If you have a uterus and use systemic oestrogen, adequate progestogen is needed to protect the lining of the womb.

When HRT is introduced or changed, the endometrium may take time to respond to the new hormonal pattern.

Bleeding can therefore occur while the body adjusts.

Other reasons may include:

• The dose of oestrogen
• The dose or type of progestogen
• Missing doses
• How medicines are being absorbed
• Switching HRT preparation
• Starting a new HRT regimen
• Polyps or fibroids
• Vaginal or cervical causes
• Changes in the endometrium
• Other gynaecological conditions

Most episodes do not indicate cancer, but persistent or unusual bleeding deserves appropriate assessment.

How Long Can Bleeding Be Normal After Starting HRT?

NICE’s updated 2026 guidance states that vaginal bleeding can be a common side effect:

• During the first six months after starting systemic HRT
• During the first three months after changing the dose or preparation of systemic HRT [1]

The NHS similarly advises that irregular bleeding or spotting commonly occurs during the first few months of HRT and often settles within six months [3].

This does not mean every episode within this period should be ignored.

Heavy, prolonged or otherwise concerning bleeding should still be discussed with a healthcare professional.

When Should I Seek Medical Advice?

NICE advises women to seek medical help promptly if unscheduled bleeding continues beyond the expected adjustment periods [1].

This includes bleeding that:

• Continues beyond six months after starting systemic HRT
• Starts or persists more than three months after changing an HRT dose or preparation
• Becomes noticeably heavier
• Is prolonged
• Appears unexpectedly after a previously stable bleed-free period

The BMS guidance recommends more urgent investigation in certain circumstances depending on timing, bleeding pattern and individual endometrial cancer risk factors [2].

What If I Am Not Taking HRT?

Bleeding after menopause should always be checked.

If you have not had a natural period for more than 12 months and then experience vaginal bleeding, spotting or a pink or brown discharge, the NHS advises contacting your GP even if it has only happened once or the amount is very small [4].

Most cases of postmenopausal bleeding are not caused by cancer, but early assessment is important because abnormal bleeding can occasionally be an early warning sign.

Why Does the Type of HRT Matter?

Understanding your regime is important when deciding whether bleeding is expected.

Sequential HRT

Sequential HRT is usually used while women are still experiencing periods or during earlier stages of the menopause transition.

A regular withdrawal bleed may be expected.

Bleeding at other points in the cycle, persistent spotting or a major change in bleeding pattern may warrant review.

Continuous Combined HRT

Continuous combined HRT is generally designed to become bleed-free.

Spotting is common during the first four to six months while the endometrium adjusts [3].

If bleeding persists beyond the expected settling period or develops after you have been bleed-free, it should be discussed with a clinician.

Why Progesterone or Progestogen Matters

For a woman with a uterus taking systemic oestrogen, adequate endometrial protection is essential.

Progestogen opposes the effect of oestrogen on the womb lining.

The British Menopause Society recommends that the dose and duration of progestogen should be proportionate to the dose of oestrogen [2].

In June 2026, the BMS updated its prescribing tables to provide greater consistency around equivalent oestrogen doses and suggested progestogen doses [5].

This is particularly relevant where women use higher doses of oestrogen or separate oestrogen and progesterone preparations.

It is one reason menopause treatment should be periodically reviewed rather than remaining unchanged indefinitely without clinical oversight.

Could Missing Medication Cause Bleeding?

Yes.

If progesterone or progestogen doses are missed, taken inconsistently or misunderstood, this can contribute to unexpected bleeding.

During an HRT review, clinicians may ask:

• Which products are you using?
• What dose are you using?
• When do you take them?
• Have you missed doses?
• Have you recently changed brand or preparation?
• How long have you been using the current regime?
• When did the bleeding begin?

Sometimes improving adherence or simplifying the regimen may resolve the issue.

What Risk Factors Might Change the Investigation?

The BMS recommends considering individual risk factors for endometrial hyperplasia and cancer when evaluating unscheduled bleeding [2].

Factors clinicians may consider include:

• Higher BMI
• Diabetes
• Polycystic ovary syndrome
• Certain hereditary cancer syndromes
• The HRT regimen being used
• Duration of symptoms
• Whether bleeding is heavy or prolonged

This does not mean having one of these factors means you have cancer. It means the threshold for further investigation may be different.

What Happens If Bleeding Needs Investigating?

Assessment may begin with a detailed history.

Your clinician may review:

• Your HRT
• Your bleeding pattern
• Your medical history
• Your cervical screening history
• Any relevant risk factors

Depending on the situation, examination or investigations may then be recommended.

What Is a Transvaginal Ultrasound?

A transvaginal ultrasound scan can assess the uterus, ovaries and thickness and appearance of the endometrium.

The British Menopause Society recommends urgent transvaginal ultrasound within six weeks in some women whose unscheduled bleeding requires further investigation [2].

The need for imaging depends upon the timing and nature of bleeding and individual risk.

If the womb lining is thicker than expected or cannot be adequately assessed, further investigations such as hysteroscopy or endometrial biopsy may sometimes be required.

Does Bleeding Mean I Have to Stop HRT?

Not necessarily.

For many women, the solution may involve modifying the HRT regimen rather than stopping treatment.

Possible changes might include:

• Reviewing the progestogen dose
• Changing the type of progestogen
• Adjusting oestrogen
• Switching preparation
• Simplifying the regimen
• Considering an intrauterine system for endometrial protection where suitable

The decision depends on symptoms, risk factors and the underlying reason for bleeding.

Do not stop or alter prescribed HRT without discussing the situation with the clinician responsible for your treatment.

What If My Scan Is Normal?

A reassuring ultrasound does not necessarily mean no further review is needed, but it can help guide management.

Where the endometrium is fully visualised and within the expected thickness for the HRT regimen, the BMS guidance indicates that endometrial cancer risk is low and HRT adjustments may be considered [2].

Persistent or worsening symptoms may still require reassessment.

Why the Three-Month HRT Review Matters

NICE recommends reviewing HRT approximately three months after treatment begins and then at least annually once treatment is established.

The early review provides an opportunity to discuss:

• Symptom improvement
• Side effects
• Bleeding
• Whether medication is being used correctly
• Dose
• Route of administration
• Progesterone or progestogen protection
• Any new health concerns

A follow-up is not simply about renewing a prescription. It is an opportunity to make sure the treatment is both effective and appropriate.

Keep a Bleeding Diary

Keeping a simple record can be extremely helpful.

Record:

• Date bleeding started
• How long it lasted
• Whether it was spotting, light, moderate or heavy
• Your HRT doses
• Missed doses
• Any medication changes
• Associated pain or other symptoms

This provides much more useful information than trying to remember several months of symptoms during an appointment.

Personalised HRT Reviews at The Menopause Medic

The Menopause Medic provides specialist HRT consultations and follow-up reviews for women who are starting treatment, adjusting treatment or experiencing new symptoms.

Where further investigation is clinically appropriate, the clinic can facilitate diagnostic referrals including ultrasound imaging.

The aim is not simply to prescribe hormones, but to review symptoms, treatment response, individual risk and the wider health picture.

Face-to-face consultations are available in Berkhamsted and St Albans, with online appointments across Hertfordshire and the UK.

Women from Hemel Hempstead, Watford, Tring, Harpenden, Welwyn Garden City, Kings Langley, Rickmansworth, Amersham, Chesham and surrounding areas can also access specialist menopause care.

References

[1] NICE. Menopause: identification and management, NG23. Updated April 2026.

[2] British Menopause Society. Management of unscheduled bleeding on hormone replacement therapy. Reviewed May 2026.

[3] NHS. Side effects of hormone replacement therapy.

[4] NHS. Postmenopausal bleeding.

[5] British Menopause Society. Updated dose tables for oestrogen and progestogen prescribing, June 2026.

[6] The Menopause Medic. Menopause consultations and diagnostic referral services.

Medical Disclaimer

This article provides general information and does not replace individual medical assessment. Vaginal bleeding after menopause or unexpected bleeding while taking HRT can have many causes. Seek advice from an appropriately qualified healthcare professional, particularly if bleeding is heavy, persistent, unusual for you or occurs after a period of being bleed-free.