How Do You Know When Menopause Has Started?

You know you have reached menopause once you have gone 12 months in a row without a period, with no other cause. You can only confirm it in hindsight. It is harder to tell if you use hormonal contraception, a hormonal IUD or HRT, or have had a hysterectomy. Then, age, symptoms and sometimes blood tests guide the decision.

The 12-month rule

The World Health Organization defines natural menopause as 12 consecutive months without a period, with no other physical cause and no medical intervention responsible.

In practice, that means:

• Your final period is only recognizable looking back.
• If a period arrives after 11 months, the count starts again.
• The day 12 months after your final period is the date of menopause. From then on, you are postmenopausal.

The UK’s National Institute for Health and Care Excellence (NICE) advises that, for otherwise healthy people aged 45 or over who are not using hormonal contraception, menopause can be identified without laboratory tests once there has been no period for at least 12 months.

For an overview of the stages, see the stages of menopause.

What signs suggest menopause is approaching?

Before the final period, most people notice:

• Longer gaps between periods, often 60 days or more in the late stage of perimenopause
• More skipped periods, sometimes with an unexpected period after months without one
• Hot flashes and night sweats becoming more frequent
• Sleep problems and mood changes

These signs suggest you are in late perimenopause, not that menopause has already happened. See the stages of menopause for how each stage is defined. See the early signs of perimenopause for what comes first.

Is there a test to confirm menopause?

For most people over 45, no test is needed, and hormone tests can mislead. FSH levels swing during perimenopause, so one high result does not confirm menopause, and a normal one does not rule it out.

Blood tests are more useful:

• Between 40 and 45, where NICE suggests an FSH test may be considered alongside symptoms
• Under 40, to investigate possible premature ovarian insufficiency. See early menopause.
• Over 50 on certain progestogen-only contraception, to help decide when contraception can stop

See perimenopause tests for what each test can and cannot tell you.

How can you tell in special situations?

This is where it gets harder. Here is how the main situations are usually handled.

If you use combined hormonal contraception (pill, patch or ring)

Combined methods cause monthly withdrawal bleeds, which are not natural periods. They also mask menopause symptoms and make FSH results unreliable.

Under UK guidance from the Faculty of Sexual and Reproductive Healthcare (FSRH), the combined pill can be used until 50 if suitable, and the NHS does not recommend it from 50. After that, people usually switch to a progestogen-only or non-hormonal method, which makes it easier to judge what is happening.

If you use a progestogen-only pill, implant or injection

These methods often make periods irregular, light or absent, so you can’t rely on bleeding. The FSRH describes two approaches:

• Continue until 55. The progestogen-only pill and implant can generally be used until then, when contraception is no longer needed for anyone.
• Check FSH if you are over 50. For people over 50 using a progestogen-only pill or implant with no periods, two FSH tests taken one to two months apart can help. If both are raised, contraception can stop after one more year.

The injection is usually switched to another method at around 50.

If you have a hormonal IUD

The hormonal IUD often makes periods very light or stops them. That makes it hard to know when natural periods would have ended. The FSRH supports keeping a hormonal IUD inserted at 45 or over in place for contraception until 55. Your clinician can use your age and symptoms, and sometimes FSH tests over 50, to judge your stage.

A hormonal IUD can also provide the progestogen part of HRT, so it is often kept if you start estrogen.

If you use HRT

HRT can cause regular or irregular bleeding depending on the type, and it relieves symptoms, which hides the natural pattern. FSH results are also unreliable on HRT. Clinicians usually rely on your age and history:

• Cyclical (sequential) HRT causes a monthly bleed and is typically used while you are still in perimenopause or within a year of your last period.
• Continuous combined HRT is designed to be bleed-free and is usually used once you are postmenopausal.

Unexpected bleeding on HRT, particularly after the first few months or after a period of no bleeding, should be discussed with your clinician.

If you have had a hysterectomy but kept your ovaries

Without a womb, you won’t have periods to count, but your ovaries still go through the transition. NICE advises identifying menopause from the type and pattern of your symptoms, such as hot flashes. The NHS notes that menopause may come sooner than it otherwise would after a hysterectomy.

If you have had both ovaries removed

If both ovaries are removed before natural menopause, you reach menopause immediately, whatever your age. No waiting period or test is needed. See surgical menopause.

If you have had endometrial ablation

Ablation treats heavy periods by removing the womb lining, so periods may become very light or stop. Like a hysterectomy, this removes your main sign of the transition. Symptoms, age and sometimes blood tests guide the decision.

If you have had chemotherapy or pelvic radiotherapy

Cancer treatments can stop periods, sometimes temporarily. Periods and ovarian function may return months later, especially in younger people. Your cancer team can advise on contraception and how to judge whether menopause is permanent.

Why does knowing matter?

Knowing whether you have reached menopause affects several practical decisions:

• Contraception. Under UK guidance, contraception can stop 2 years after the last period if it happened before 50, 1 year after if at 50 or over, or at 55 for everyone. See pregnancy during perimenopause.
• HRT regimen. Whether you need a cyclical or continuous regimen.
• Bleeding. Once you are postmenopausal, any new bleeding needs checking.
• Long-term health. Bone loss is fastest around the final period, so it is a good time to review bone and heart health.

What if you’re still not sure?

It is very common not to know exactly when menopause happened, especially if you have used hormones for years. That is usually fine. Clinicians use your age, symptoms and history to make practical decisions, and UK guidance allows contraception to stop at 55 regardless.

Keeping a record of any bleeding and symptoms helps. Our private Symptom Explorer can help you track them. For the questions to ask, see your first menopause appointment.

Get checked promptly if you have:

• Any vaginal bleeding 12 months or more after your last period, however light
• Bleeding after sex or between periods
• New or unexpected bleeding on HRT, particularly after an initial settling period
• Periods that stop before age 40

Frequently asked questions

If I haven’t had a period for 10 months, am I in menopause?

Not yet. Menopause is confirmed after 12 months. Periods can still return, so keep using contraception until guidance says you can stop.

Can a blood test tell me I’m in menopause?

For most people over 45, blood tests aren’t needed and may mislead, because hormone levels swing. Tests are more useful under 45, or over 50 on some progestogen-only methods.

I have a Mirena coil. How will I know when I reach menopause?

A hormonal IUD often stops periods, so you may not know exactly. Your clinician may use your age and symptoms, or FSH tests after 50. Under UK guidance, a hormonal IUD fitted at 45 or over can stay in place for contraception until 55.

I had a period after 13 months. What does that mean?

Bleeding 12 months or more after your last period counts as postmenopausal bleeding. It needs to be checked by a clinician, even if it is light and you feel well.

I’m 51, not on any hormones, and haven’t had a period for a year. Can I stop contraception?

Under UK guidance, yes. If your last period was at 50 or over and you are not using hormonal contraception, contraception can stop once you have gone a full year without a period. Check with your clinician if you are unsure, or if guidance differs where you live.

References

1. World Health Organization: Menopause fact sheet
2. NICE guideline NG23: Menopause, identification and management
3. FSRH Contraception Choices: Perimenopause and menopause
4. FSRH guideline: Contraception for women aged over 40 years
5. GPnotebook: Stopping contraception in the perimenopause (summarizing FSRH guidance)
6. GPnotebook: Contraception in women aged over 50 years (summarizing FSRH guidance)
7. NHS: Symptoms of menopause and perimenopause
8. NHS: Hysterectomy: considerations
9. Leeds Teaching Hospitals NHS Trust: HRT and unscheduled vaginal bleeding
10. Australasian Menopause Society: Bleeding in perimenopause, postmenopause and on MHT
11. Harlow SD et al. Executive summary of STRAW+10 (2012), via ASRM

Editorial status: evidence-based educational article. Last evidence check: September 10, 2026.