perimenostage

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Perimenopause: symptoms, age, stages and what helps

Perimenopause is the transition before your final period, when hormone levels swing and periods become irregular. It usually starts in your 40s: the median age at onset was 47.5 in a large US study, and it lasts about 4 years on average, often longer. Common signs are changing periods, hot flashes, sleep problems and mood changes. Perimenopause ends 12 months after your last period.

Video: Perimenopause, explained: what's happening, how long it lasts, and what helps

Read the transcript (826 words)▾

Day one. I found my keys in the fridge. Day four, three a.m., soaked. Day nine, my heart took off at my desk. I thought I was falling apart.

She wasn't. She was in perimenopause, and almost nobody had explained it to her. Let's fix that. Six minutes: what it is, what it feels like, how long it lasts, how it's diagnosed, and what helps.

Perimenopause is the transition to menopause. Menopause itself is a single point: twelve months after your last period. Everything before it, the years when your hormones start to change, is perimenopause.

Most people picture estrogen sliding down a gentle slope. In perimenopause it doesn't slide. It swings. Some months it drops, some months it spikes higher than it did in your thirties, while progesterone tends to fall. That rollercoaster, not a slow decline, is behind a lot of what women feel.

For most women, menopause arrives between forty-five and fifty-five. Perimenopause starts years before that, often in the early or mid forties.

Doctors describe it in stages. In the early transition, the length of your cycle keeps changing by seven days or more from one month to the next. In the late transition, you go sixty days or more without a period, and that stage usually lasts one to three years.

Hot flashes are the famous one. Between fifty and seventy-five percent of women get hot flashes or night sweats during the transition. They're far from the only one.

Across sixteen studies, seventy-one percent of women in perimenopause reported joint or muscle pain.

In SWAN, the large American study that followed women through the transition, about half had a moderate or high chance of palpitations during perimenopause.

Women with no history of depression were more than four times as likely to have high depressive symptom scores during the transition as before it.

And memory: in SWAN, women learned new information less well during perimenopause, then bounced back after menopause.

Add broken sleep, itchy skin, a dry mouth, rage over a spoon. Each one gets blamed on stress, age or a busy life. Put them side by side, and a pattern appears.

The other side matters too. In SWAN, about one in five women started out with almost no symptoms. There is no single normal.

This is the part women are rarely told. In SWAN, frequent hot flashes lasted a median of seven point four years in total, and went on for a median of four and a half years after the final period.

Women whose hot flashes started early, while periods were still regular or just beginning to change, had the longest course: a median of more than eleven point eight years. African American women had a median of ten point one years.

So "it'll pass in a few months" is, for many women, simply not true. That's exactly why waiting it out shouldn't be the only plan.

Here's what surprises people. For women forty-five and over, UK guidelines say perimenopause can be identified from your symptoms and your cycle changes, without a blood test.

That's because hormone levels swing from day to day in the transition. A normal FSH result one week says little about the next.

There are exceptions. Under forty-five, and especially under forty, a doctor may use blood tests to look for other causes, including premature ovarian insufficiency. And because about one in eight women develops a thyroid problem, which can look a lot like perimenopause, a simple TSH test is often worth doing.

The most useful thing you can bring to an appointment is a record: your cycle dates, your main symptoms, and when they happen.

For hot flashes and night sweats, hormone therapy is the most effective option. Estrogen cuts how often hot flashes happen by about seventy-five percent. For healthy women under sixty, or within ten years of their last period, the Menopause Society finds the benefits generally outweigh the risks.

If hormones aren't right for you, there are non-hormonal medicines. Fezolinetant works directly on the brain's thermostat. Certain antidepressants, in low doses, reduce hot flashes by roughly forty to sixty-five percent.

For sleep, cognitive behavioral therapy for insomnia has strong evidence. In a trial of women with hot flashes, eighty-four percent were in the no-insomnia range six months later, compared with forty-three percent who got education alone.

None of this means everyone needs medicine. It means there are options, and they're worth a real conversation with your doctor.

A few things need a doctor soon, whatever your stage. Any bleeding twelve months or more after your last period. Palpitations with chest pain, breathlessness or fainting: that's an emergency, call 911. And periods that stop or turn irregular before forty.

Mae's turning point wasn't a test. It was someone finally putting her symptoms side by side. You can start that today. Find your stage in two minutes at perimenostage.com, and take what you learn to your doctor.

Nobody had told me. Now somebody has.

Every number in this video is sourced in the YouTube description.

Perimenopause: what women expect vs what research shows

What people often expect

“Menopause happens around 51, so there's nothing to notice before then”

What the evidence shows

The change starts years earlier. In the Massachusetts Women's Health Study of 2,570 women, perimenopause began at a median age of 47.5 and lasted nearly 4 years before the final period, at a median age of 51.3. In SWAN, the transition lasted a median of 4.37 years for women who started latest and 8.57 years for those who started earliest. Many symptoms peak in these years, not after.

Perimenopause explained: age, signs, stages and diagnosis

What is perimenopause?

Perimenopause is when your periods become irregular as the ovaries wind down, and menopause is when they stop altogether. Menopause itself is defined as 12 months without a period when you're not using hormonal contraception. The international STRAW+10 staging system defines perimenopause as starting with the early menopausal transition and ending 12 months after the final period. Hormones don't fall smoothly during this time: estrogen swings high and low, and progesterone drops as ovulation becomes irregular.

What age does perimenopause start?

Menopause usually happens between 45 and 55. In the Massachusetts Women's Health Study, perimenopause began at a median age of 47.5, and in SWAN the median age at natural menopause was 51.4. Smoking brings both earlier: current smokers reached menopause 1.8 years earlier. Menopause before 45 is called early menopause, and before 40 premature ovarian insufficiency. See our guide to perimenopause age for the full range.

The first signs of perimenopause

One of the first signs is usually a change in your periods: they come more or less often, and bleeding gets heavier or lighter. In the early transition, the length of your cycle varies by 7 days or more from one cycle to the next. Hot flashes, trouble sleeping, mood swings, anxiety and brain fog often come alongside, sometimes before periods change much. Because these signs are gradual, many women only recognize them looking back.

Perimenopause symptoms

The NHS lists changes to periods, hot flashes and night sweats, sleep problems, mood changes, memory and concentration problems, weight gain, vaginal dryness, more UTIs, palpitations, headaches, joint pain, hair thinning, dry and itchy skin, low libido and mouth problems. SWAN tracked 58 symptoms and found six patterns, from highly symptomatic to almost symptom-free. Our full symptoms list has a page for each.

The stages of perimenopause

STRAW+10 splits the transition into two stages. In the early transition, cycle length becomes variable. In the late transition, you start skipping periods, with gaps of 60 days or more; this stage lasts 1 to 3 years on average, and hot flashes are most likely. After the final period come the early postmenopause stages, when FSH and estradiol keep changing for about 2 years before settling.

How long does perimenopause last?

About 4 years on average, but it varies a lot. In SWAN, the earlier the transition began, the longer it lasted: a median of 4.37 years for women who started latest, 8.57 years for women who started earliest. Smokers tended to start earlier and have a shorter transition. Symptoms can outlast perimenopause itself: frequent hot flashes lasted a median of 7.4 years in total.

Perimenopause vs menopause vs postmenopause

Premenopause means your reproductive years before any changes. Perimenopause is the transition, with irregular periods and swinging hormones. Menopause is a single point in time, 12 months after your last period. Postmenopause is everything after that. People often say menopause to mean the whole process, which is why the terms get confused. The practical difference: in perimenopause you can still get pregnant and your hormones fluctuate; after menopause they stay low.

How perimenopause is diagnosed

There's no routine test for perimenopause. NICE advises doctors to identify it from symptoms and cycle changes in women aged 45 or over, without blood tests, because hormone levels swing too much to give a clear answer. Between 40 and 45, an FSH blood test may be used. Under 40, diagnosing premature ovarian insufficiency needs raised FSH on 2 blood samples taken 4 to 6 weeks apart. Our 2-minute check maps your answers to a stage.

Pregnancy and contraception in perimenopause

You can still get pregnant in perimenopause, because ovulation becomes unpredictable rather than stopping. Women do still conceive in their late 40s and even into their 50s. UK menopause experts advise continuing contraception for 2 years after your last period if you're under 50, 1 year if you're over 50, or until 55. HRT is not contraception. Perimenopause can make a pregnancy harder to spot, because late periods are common, so take a test if a period is late and there is any chance.

Perimenopause by the numbers

From the studies on this page

  • average length of perimenopause before the final period, longer when it starts early

    ~4 years

    Bar scaled to a 12-year reference span

  • of women have hot flashes, night sweats or both during the transition

    50–75%

    Reported range across studies or subgroups

47.5

median age at the start of perimenopause in the Massachusetts Women's Health Study

51.4

median age at natural menopause in SWAN, a study of 14,620 US women

Every woman who has periods goes through perimenopause unless it's cut short by surgery or medical treatment. What varies is when it starts, how long it lasts and how many symptoms it brings.

Common questions

10 guides.

What it isThe stages of menopause

The '7 stages' idea isn't a medical model. Doctors use STRAW+10: late reproductive, early and late transition, final period, postmenopause.…

Perimenopause guides

Perimenopause treatment: what works

  • HRT for perimenopause symptoms

    Strong evidence

    Estrogen, with a progestogen if you have a uterus, cuts hot flash frequency by about 75% and helps sleep, mood linked to menopause, vaginal dryness and bone health. NICE advises offering HRT for hot flashes, and it can be started while you still have periods. For women under 60 without specific risks, the benefits usually outweigh the risks.

    Related guide →
  • Hormonal contraception in perimenopause

    Strong evidence

    If you still need contraception, the combined pill, patch or ring can manage irregular or heavy periods, may help bone density and can relieve hot flashes, and is suitable until 50 if you have no health risks such as smoking, high blood pressure or migraine with aura. The hormonal IUD treats heavy periods and can later provide the progestogen part of HRT.

    Related guide →
  • Non-hormonal perimenopause treatment

    Strong evidence

    If hormones aren't suitable, fezolinetant, some SSRIs and SNRIs, and gabapentin reduce hot flashes, and The Menopause Society rates them at its highest level of evidence. SSRIs and SNRIs cut hot flash frequency by about 40–65%. Menopause-specific CBT helps hot flashes, sleep and low mood.

    Related guide →
  • Vaginal estrogen for dryness and UTIs

    Strong evidence

    Low-dose vaginal estrogen improves vaginal dryness and painful sex by 60–80% and cuts repeat UTIs. It's absorbed mainly locally, and NICE recommends offering it, including alongside systemic HRT. Vaginal and urinary symptoms often get worse over time without treatment, unlike hot flashes, so it is worth treating them early.

    Related guide →
  • Lifestyle changes for perimenopause

    First step

    Regular exercise, including weight-bearing and strength work for bones, a balanced diet with calcium, regular sleep routines, not smoking and keeping alcohol within limits all help symptoms and long-term health. Relaxation, yoga and talking to others going through the same thing help mood. These steps will not replace medical treatment for severe symptoms, but they make everything else work better.

    Related guide →

When perimenopause symptoms need a doctor

  • Urgent: Any bleeding 12 months or more after your last period

    Always get it checked, even if it's small or happened once. You should see a specialist within 2 weeks.

    More →
  • Bleeding between periods, after sex, or much heavier periods

    See a doctor. Polyps, fibroids and, rarely, precancerous changes need ruling out, and heavy bleeding can cause anemia.

    More →
  • Symptoms before 40, or before 45

    See a doctor. Periods stopping before 45 is early menopause, and before 40 premature ovarian insufficiency; replacing hormones protects bones and heart.

    More →
  • Symptoms affecting your work, sleep or relationships

    See a doctor. You don't need a blood test to get treatment if you're over 45, and early advice helps.

  • Urgent: Thoughts of harming yourself

    Get help now: call or text 988, or call 911 in an emergency. In the UK, call 111 (mental health option), Samaritans on 116 123, or 999.

Perimenopause: questions women ask

What is perimenopause?

Perimenopause is the transition before your final period, when the ovaries wind down, hormone levels swing and periods become irregular. It usually starts in your 40s, lasts about 4 years on average and ends 12 months after your last period, when you've reached menopause.

What age does perimenopause start?

Usually in your 40s. The median age at onset was 47.5 in the Massachusetts Women's Health Study, and menopause usually happens between 45 and 55. It can start earlier, especially in smokers. Symptoms before 45 are early menopause, and before 40 premature ovarian insufficiency.

Related →

What are the first signs of perimenopause?

Usually a change in your periods: they come more or less often, or get heavier or lighter, with cycle lengths that vary by 7 days or more. Hot flashes, trouble sleeping, mood swings and brain fog often follow or come at the same time.

What are the symptoms of perimenopause?

The most common are irregular periods, hot flashes and night sweats, sleep problems, mood swings, anxiety, brain fog, vaginal dryness, low libido, joint pain and palpitations. SWAN tracked 58 symptoms, and women differ a lot in how many they get.

Related →

What is the difference between perimenopause and menopause?

Perimenopause is the transition, when periods become irregular and hormones swing. Menopause is the point 12 months after your last period. Everything after is postmenopause. In perimenopause you can still get pregnant. The terms matter because treatment differs: HRT regimens and contraception advice change once you are past menopause.

Related →

Is premenopause the same as perimenopause?

No. Premenopause is the time before any menopause changes, with regular cycles. Perimenopause is the transition that follows, starting when your cycle length begins to vary. The terms are often mixed up in everyday use.

Are there tests for perimenopause?

There's no routine test. NICE advises diagnosing perimenopause from symptoms and cycle changes in women 45 and over, without blood tests. An FSH test may help between 40 and 45, and is needed to diagnose premature ovarian insufficiency under 40. Symptom checklists and a cycle diary help most.

Related →

What is the treatment for perimenopause?

It depends on your symptoms. HRT is the most effective treatment for hot flashes and many other symptoms and can be started while you still have periods. Hormonal contraception suits women who also need contraception. Non-hormonal medicines, CBT and vaginal estrogen are other options.

Related →

How long does perimenopause last?

About 4 years on average, but anywhere from a few months to more than 8 years. In SWAN, women who started the transition earliest had it longest. The late stage, with skipped periods, lasts 1 to 3 years on average.

Related →

Can you get pregnant during perimenopause?

Yes. Ovulation becomes unpredictable, not absent, and women do still conceive in their late 40s and 50s. Use contraception until you've had no periods for 2 years if you're under 50, 1 year if you're over 50, or until 55.

Related →

What is the difference between perimenopause and postmenopause?

Perimenopause is the transition before your final period, with irregular cycles and swinging hormones. Postmenopause begins 12 months after your last period. In the first few years after it, FSH and estradiol keep changing and hot flashes are common; after that, hormone levels settle low, and vaginal and urinary symptoms and bone loss become the bigger issues.

Sources

  1. NHS. What are menopause and perimenopause?
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  3. Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10. J Clin Endocrinol Metab. 2012;97(4):1159-1168.
  4. Paramsothy P, Harlow SD, Nan B, et al. Duration of the menopausal transition is longer in women with young age at onset: the multiethnic Study of Women's Health Across the Nation. Menopause. 2017;24(2):142-149.
  5. Prior JC. Progesterone for Symptomatic Perimenopause Treatment - Progesterone politics, physiology and potential for perimenopause. Facts Views Vis Obgyn. 2011;3(2):109-20.
  6. Gold EB, Bromberger J, Crawford S, et al. Factors associated with age at natural menopause in a multiethnic sample of midlife women. Am J Epidemiol. 2001;153(9):865-74.
  7. NHS. Early or premature menopause.
  8. NHS. Symptoms of menopause and perimenopause.
  9. Harlow SD, Karvonen-Gutierrez C, Elliott MR, et al. It is not just menopause: symptom clustering in the Study of Women's Health Across the Nation. Womens Midlife Health. 2017;3:2.
  10. Avis NE, Crawford SL, Greendale G, et al. Duration of menopausal vasomotor symptoms over the menopause transition. JAMA Intern Med. 2015;175(4):531-9.
  11. Women's Health Concern (British Menopause Society). Contraception for women over the age of 40. Fact sheet, 2025.
  12. NICE. Menopause: identification and management (NG23). Updated 2024.
  13. Crandall CJ, Mehta JM, Manson JE. Management of Menopausal Symptoms: A Review. JAMA. 2023;329(5):405-420.
  14. NHS. Benefits and risks of hormone replacement therapy (HRT).
  15. The North American Menopause Society. The 2023 nonhormone therapy position statement of The North American Menopause Society. Menopause. 2023;30(6):573-590.
  16. Chen YY, Su TH, Lau HH. Estrogen for the prevention of recurrent urinary tract infections in postmenopausal women: a meta-analysis of randomized controlled trials. Int Urogynecol J. 2021;32(1):17-25.
  17. NHS. Things you can do to help menopause and perimenopause symptoms.
  18. NHS. Postmenopausal bleeding.
  19. Dreisler E, Frandsen CS, Ulrich L. Perimenopausal abnormal uterine bleeding. Maturitas. 2024;184:107944.
  20. Federal Communications Commission. 988 Suicide & Crisis Lifeline.
  21. National 911 Program. 911.gov.
  22. NHS. Where to get urgent help for mental health.
  23. Greendale GA, Sowers M, Han W, et al. Bone mineral density loss in relation to the final menstrual period in a multiethnic cohort: results from the Study of Women's Health Across the Nation (SWAN). J Bone Miner Res. 2012;27(1):111-8.

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