Last checked September 2026 against 30 sources · Editorial policy
Hormones in perimenopause and menopause: what changes and when
Hormone changes in menopause follow a rough order. Progesterone often falls first, as more cycles skip ovulation. FSH starts rising about 6 years before the final period. Estradiol swings, sometimes higher than before, then falls from about 2 years before the last period and levels off about 2 years after. After menopause, estrone made in body fat becomes the main estrogen, and testosterone continues from the ovaries for years.
Estrogen swings then falls, progesterone drops first, FSH rises. A stage-by-stage timeline of hormone changes, and guides to every hormone and test.
Hormone changes in menopause: expectation vs reality
What people often expect
“My hormones drop steadily through my 40s, and a blood test will show where I am”
What the evidence shows
Hormones swing rather than slide. In SWAN, women followed four different estradiol patterns, and 31.5% had a rise before a steep fall. FSH can jump into the menopausal range and drop back. That's why NICE advises against using estradiol, FSH or AMH tests to diagnose perimenopause from 45, relying on symptoms and cycle changes instead.
What happens to hormones during perimenopause and menopause
Hormone levels during perimenopause
As the supply of eggs falls, the ovaries make less anti-Mullerian hormone and inhibin B, while FSH and LH from the pituitary gland rise. In a study of women sampled through a full cycle, FSH, LH and estradiol in ovulatory cycles all rose with each stage of reproductive aging, while progesterone after ovulation fell. AMH dropped 10- to 15-fold across the stages.
Learn more →Progesterone drops first
Progesterone is made after ovulation, and ovulation becomes less reliable in perimenopause. In one study, nine cycles without ovulation occurred in the late menopause transition group, and luteal progesterone fell with each stage. Low progesterone is linked to irregular or heavier periods, poor sleep and mood changes, often years before estrogen falls.
Learn more →Estrogen levels in perimenopause
In SWAN, average estradiol didn't change until about 2 years before the final period, then fell fastest around it and stabilized about 2 years after. Individual women vary: 26.9% declined slowly, 28.6% stayed fairly flat, 13.1% rose then declined slowly and 31.5% rose then fell steeply. Obesity made a flat pattern more likely.
Learn more →Hormone fluctuations and symptoms
Swinging hormones explain why perimenopause feels unpredictable: heavy periods and sore breasts when estrogen runs high without progesterone, hot flashes and night sweats when it drops, and poor sleep and mood changes along the way. One of the first signs is usually a change in periods, which may come more or less often and get heavier or lighter.
Learn more →What happens to hormones after menopause
With no more ovulation, progesterone stays near zero; Labcorp's postmenopausal range is 0.0 to 0.1 ng/mL. Estradiol settles low, 6.0 to 54.7 pg/mL at Labcorp, and estrone from body fat and the adrenal glands becomes the main estrogen. FSH stays high, 25.8 to 134.8 mIU/mL. The ovaries keep making testosterone for up to 20 years.
Learn more →Best time to check hormone levels in perimenopause
From 45, usually never: NICE says perimenopause can be identified from recent hot flashes and any cycle change without tests. Between 40 and 45, and under 40, an FSH test may help confirm menopause. For fertility testing, FSH is measured on day 3 of the cycle. If you do test, note your cycle day, since every hormone changes through the month.
Learn more →Perimenopause hormone balance
Balance here means enough progesterone to offset estrogen's effect on the uterine lining. When cycles skip ovulation, estrogen can act unopposed, which some clinicians call estrogen dominance. If you take estrogen for symptoms and have a uterus, a progestogen restores that balance; if heavy bleeding is the problem, a levonorgestrel IUD is a first-line option.
Learn more →Hormone changes and HRT
HRT replaces the estrogen that falls and adds a progestogen to protect the uterus. It's the most effective treatment for hot flashes and helps prevent bone loss. The FDA's updated labels suggest considering it for moderate to severe hot flashes in women under 60 or within 10 years of menopause. You don't need a hormone test to start.
Learn more →Hormone levels in menopause by the numbers
From the studies on this page
before the final period is when FSH starts rising, on average, in SWAN
6 years
Bar scaled to a 12-year reference span
before the final period is when average estradiol starts to fall
2 years
Bar scaled to a 12-year reference span
of women had estradiol that rose before falling steeply around menopause
31.5%
25.8–134.8 mIU/mL
Timing varies: obesity delayed and blunted the FSH rise in SWAN, and lab ranges differ.
Browse by hormone
29 guides.
Estrogen runs the cycle and affects brain, bone, skin and heart. Its three types, how levels change in perimenopause, and signs of low or…
Progesterone prepares the uterine lining, supports pregnancy and may aid sleep. It often falls first in perimenopause. What it does, normal…
Soy, flaxseed and sesame are the richest sources of phytoestrogens, plant compounds similar in structure to estrogen. Which foods have the…
Drowsiness, dizziness, bloating, breast tenderness and mood changes are the most common. Pill and cream side effects, how long they last,…
Micronized progesterone (Prometrium, Utrogestan) vs synthetic progestins like medroxyprogesterone and norethindrone. Uses, doses, prices,…
Hot flashes, vaginal dryness, poor sleep, low mood and joint pain are classic low-estrogen signs. Causes at every age, the tests, and a…
Heavy periods, sore breasts, bloating and mood swings can mean high estrogen relative to progesterone, common in perimenopause. Signs,…
Food and supplements can't replace falling estrogen. When low weight, overtraining or stress are the cause, lifestyle helps; otherwise HRT…
Irregular or heavy periods, poor sleep, anxiety and hot flashes can signal low progesterone, often the first hormone change in…
Medroxyprogesterone is a synthetic progestin used to bring on periods, treat abnormal bleeding and protect the uterus on HRT. Doses and…
Estradiol ranges by cycle phase, in perimenopause and after menopause. What your result means and why a single test can mislead in your
Progesterone comes from ovulation, so food can't raise it much. What supports ovulation, which supplements lack evidence, and prescription…
Micronized progesterone is taken as 100 mg daily (continuous) or 200 mg for 12 days a month (cyclical) alongside estrogen. Which regimen…
No supplement contains estrogen. Soy isoflavones, red clover and black cohosh have mixed evidence for hot flashes. What works, what…
Soy contains isoflavones, plant compounds similar in structure to estrogen. What studies show for estrogen levels, hot flashes, breast…
Estrogen builds the uterine lining and drives the first half of the cycle; progesterone stabilizes it after ovulation. How the balance…
Progesterone ranges in the follicular and luteal phase, in pregnancy and after menopause. Why timing matters and what a low or high result…
Progesterone can cause bloating and fluid retention, but studies don't show weight gain on HRT with progesterone. Why the scale moves and…
Over-the-counter progesterone and wild yam creams deliver little progesterone and don't protect the uterus on HRT. What trials show,…
An estradiol blood test measures your main estrogen. When in your cycle to test, normal ranges, why it can't diagnose perimenopause, and…
High progesterone usually comes from pregnancy, the luteal phase or medication. Symptoms like bloating, sleepiness and breast tenderness,…
Micronized progesterone is needed with estrogen if you have a uterus and may help sleep; evidence for hot flashes on its own is mixed.…
Micronized progesterone causes drowsiness, so bedtime dosing is standard. Timing for cyclical and continuous HRT, with or without food, and…
FSH rises as the ovaries slow, but in perimenopause it swings day to day. Ranges by stage, why one FSH test can't confirm perimenopause,…
DIM comes from cruciferous vegetables and changes how estrogen is broken down. What studies show, the tamoxifen warning, side effects, and…
Estrogen peaks just before ovulation, dips, rises again after it, then drops before your period. Ranges by phase and how perimenopause…
Progesterone is identical to your own hormone; progestins are synthetic versions used in birth control and some HRT. Differences in side…
Flaxseed is the richest food source of lignans, a type of phytoestrogen. What studies show for hot flashes and estrogen, safety, and how…
Taking progesterone can stop or lighten bleeding; stopping it triggers a withdrawal bleed. What to expect on cyclical and continuous…
A–Z
- DIM for estrogen dominance
- Does progesterone cause weight gain?
- Does progesterone stop your period?
- Does soy contain estrogen?
- Estradiol lab test
- Estradiol levels
- Estrogen
- Estrogen during the menstrual cycle
- Estrogen supplements
- Estrogen vs progesterone
- Flax seeds and estrogen
- Foods high in estrogen (phytoestrogens)
- FSH levels in perimenopause and menopause
- High estrogen and estrogen dominance symptoms
- High progesterone symptoms
- How to increase estrogen naturally
- How to increase progesterone
- Low estrogen symptoms
- Low progesterone symptoms
- Medroxyprogesterone (Provera)
- Progesterone
- Progesterone 100 mg and 200 mg
- Progesterone for perimenopause
- Progesterone levels
- Progesterone pills
- Progesterone side effects
- Progesterone supplements and OTC cream
- Progestin vs progesterone
- When to take progesterone
Hormone guides
Estrogen
Progesterone
Progesterone medicines
Hormone tests
Managing hormone changes in menopause
HRT for symptoms from falling estrogen
First stepThe most effective treatment for hot flashes, and it protects bones. With a uterus, estrogen is paired with progesterone; patches and gels avoid the extra clot risk of pills.
Related guide →Progestogen for heavy perimenopausal periods
First stepA levonorgestrel IUD is NICE's suggested first treatment for heavy bleeding in many women and doubles as contraception.
Related guide →Lifestyle changes for menopause
Strong evidenceQuitting smoking, 2 hours and 30 minutes of moderate activity a week, muscle-strengthening exercise twice a week, and 1,200 mg of calcium a day from 51 protect heart and bones as hormones change.
Related guide →Non-hormonal treatments
Strong evidenceCBT, SSRIs or SNRIs, gabapentin and fezolinetant are recommended if you can't or don't want to take hormones.
Related guide →Hormone-balancing supplements
No good evidenceNot recommended for hot flashes by The North American Menopause Society; soy isoflavones don't raise estrogen in trials.
Related guide →
When to see a doctor about hormone changes
Periods stop or change before 45
See a doctor; early menopause needs testing and treatment to protect bones and heart.
More →Heavy periods or bleeding between periods
See a doctor; unopposed estrogen and other causes need checking.
More →Symptoms affecting sleep, work or relationships
Ask about HRT or non-hormonal treatment; you don't need to wait for periods to stop.
Any bleeding after 12 months without a period
See a doctor; bleeding after menopause always needs checking.
More →
Hormone changes in menopause: questions women ask
What happens to hormones during menopause?
Progesterone falls first as ovulation becomes irregular, FSH rises from about 6 years before the last period, and estradiol swings, then falls in the last 2 years. After menopause, estrone becomes the main estrogen and FSH stays high.
What are normal hormone levels in perimenopause?
There's no perimenopause range, because levels swing from cycle to cycle. FSH can be normal one month and menopausal the next, and estradiol can be higher than in younger women. That's why doctors rely on symptoms from 45.
What are estrogen levels in perimenopause?
They vary widely. In ovulatory cycles, estradiol tends to be higher than in younger women; in SWAN, average estradiol only started to fall about 2 years before the final period.
Related →What is the best time to check hormone levels for perimenopause?
From 45 you usually don't need a test. Under 45, an FSH test can help confirm menopause; for fertility testing, FSH is checked on day 3 of your cycle. Always note your cycle day.
Related →How do periods change in menopause?
One of the first signs is a change in periods: they may come more or less often and get heavier or lighter, then stop. Menopause is confirmed after 12 months without a period.
Related →What lifestyle changes help in menopause?
Quitting smoking, regular moderate activity with muscle-strengthening twice a week, enough calcium and vitamin D, and a healthy weight. These protect bones and heart as estrogen falls.
Can you balance hormones naturally in perimenopause?
Not in the sense of restoring premenopausal levels; the ovaries are winding down. Supplements didn't raise estrogen in trials. HRT, a progestogen or IUD for heavy bleeding, and non-hormonal medicines treat the symptoms.
What hormone causes hot flashes?
Falling estrogen is the main driver, which is why estrogen therapy is the most effective treatment. Low progesterone is also linked to hot flashes, and 300 mg of progesterone reduced them after menopause in a trial.
Related →Is there a perimenopausal hormone levels chart?
Charts can show typical ranges, but perimenopausal levels swing too much to place you on one. For reference, Labcorp's postmenopausal ranges are 25.8 to 134.8 mIU/mL for FSH, 6.0 to 54.7 pg/mL for estradiol and 0.0 to 0.1 ng/mL for progesterone.
Related →Why do hormones fluctuate so much in perimenopause?
Because ovulation becomes irregular. Some cycles release an egg with a surge of estradiol and a luteal rise in progesterone; others skip ovulation, with no progesterone at all. The late transition is marked by extreme fluctuations in hormone levels and gaps of 60 days or more between periods.
Sources
- Hale GE, Zhao X, Hughes CL, et al. Endocrine features of menstrual cycles in middle and late reproductive age and the menopausal transition classified according to the Staging of Reproductive Aging Workshop (STRAW) staging system. J Clin Endocrinol Metab. 2007;92(8):3060-7.
- Randolph JF Jr, Zheng H, Sowers MR, et al. Change in follicle-stimulating hormone and estradiol across the menopausal transition: effect of age at the final menstrual period. J Clin Endocrinol Metab. 2011;96(3):746-54.
- Cleveland Clinic. Estrone: function, hormone levels and testing.
- NHS. Hysterectomy: considerations.
- Tepper PG, Randolph JF Jr, McConnell DS, et al. Trajectory clustering of estradiol and follicle-stimulating hormone during the menopausal transition among women in the Study of Women's Health across the Nation (SWAN). J Clin Endocrinol Metab. 2012;97(8):2872-80.
- 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.
- NICE. Menopause: identification and management (NG23). Updated 2024.
- MedlinePlus, US National Library of Medicine. Follicle-stimulating hormone (FSH) levels test.
- Cleveland Clinic. Progesterone: natural function, levels and side effects.
- Cleveland Clinic. High estrogen: causes, symptoms, dominance and treatment.
- Cleveland Clinic. Low estrogen: causes, symptoms, diagnosis and treatment.
- NHS. Symptoms of menopause and perimenopause.
- Labcorp. Progesterone (test 004317): reference range.
- Labcorp. Estradiol (test 004515): reference range and clinical information.
- Labcorp. Follicle-stimulating hormone (FSH) (test 004309): reference range.
- Cleveland Clinic. Follicle-stimulating hormone (FSH).
- MedlinePlus, US National Library of Medicine. Estrogen levels test.
- NHS. Utrogestan (micronised progesterone): about.
- NICE. Heavy menstrual bleeding: assessment and management (NG88).
- The North American Menopause Society. The 2023 nonhormone therapy position statement of The North American Menopause Society. Menopause. 2023;30(6):573-590.
- US Food and Drug Administration. FDA requests labeling changes related to safety information to clarify the benefit/risk considerations for menopausal hormone therapies. 2025.
- NHS. When to take hormone replacement therapy (HRT).
- Vinogradova Y, Coupland C, Hippisley-Cox J. Use of hormone replacement therapy and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases. BMJ. 2019;364:k4810.
- Women's Health Concern (British Menopause Society). Contraception for women over the age of 40. Fact sheet, 2025.
- Office on Women's Health, US Department of Health and Human Services. Menopause and your health.
- Viscardi G, Back S, Ahmed A, et al. Effect of Soy Isoflavones on Measures of Estrogenicity: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Adv Nutr. 2025;16(1):100327.
- NHS. Early or premature menopause.
- NHS. Heavy periods.
- NHS. Postmenopausal bleeding.
- Hitchcock CL, Prior JC. Oral micronized progesterone for vasomotor symptoms--a placebo-controlled randomized trial in healthy postmenopausal women. Menopause. 2012;19(8):886-93.
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