Body & cyclesPerimenopause fatigue
Tiredness that sleep doesn't fix is one of the most common perimenopause symptoms. Hormonal causes, blood tests to rule out (ferritin, TSH,…
Evidence-based stage check
Perimenopause is not only a 50+ topic: 55.4% of women aged 30–35 reported moderate or severe symptoms (Cunningham AC et al., npj Women's Health, 2025, n = 4,432).
Find your perimenopause stage in 2 minutes
A quick check against clinical criteria, plus a one-page brief you can take to your doctor.
Based on STRAW+10 staging
Check where you are in the transition
See whether your cycle patterns fit early transition, late transition, or earlier shifts.
What fits you best right now:
Start stage check →shield Stored on our servers in the Netherlands. Never shared with advertisers.science Stage criteria: STRAW+10 ↗
A sample of the report you get from your answers.Sample report →
83%psychology
Fatigue
of women 35+ reported fatigue in a Mayo Clinic and Flo survey of 17,494 women.
45+biotech
No blood test needed
From 45, NICE identifies perimenopause from recently started hot flashes and cycle changes, without lab tests.
1–3 yearstimelapse
Late transition
lasts 1 to 3 years on average.
12 monthsevent_busy
Without a period
without a period confirms menopause.
Symptom Directory
Browse by body system
Search all 50 symptom guides — we show up to 6 here. The full list is on the symptoms page.
Mind & moodBrain fog and memory loss in menopause
Forgetting words and losing focus is common in perimenopause and usually improves after menopause. Why it happens, when to worry about…
Hot flashes & sleepNight sweats
Perimenopause is a common cause in women in their 40s, but medications, infections, thyroid problems and anxiety cause night sweats too.…
Joints & musclesJoint pain in menopause
Aching, stiff joints are a common and overlooked menopause symptom. How estrogen affects joints, how to tell it from arthritis, and what…
Hot flashes & sleepMenopause insomnia
Night sweats, falling progesterone and anxiety all disrupt sleep in menopause. CBT-I, HRT and other treatments that work, and how long…
Skin & hairHair loss in perimenopause and menopause
Midlife hair thinning is often hormonal, but low iron and thyroid problems are common culprits. Tests to ask for, what HRT does for hair,…
Showing 6 of 50 symptom guides.
View all symptoms →Meal plan · $27 one-time
A 28-day perimenopause meal plan, built from your answers
- Vegan, gluten-free, dairy-free, or anything else
- Allergies and foods you won't eat, left out
- Protein, fiber and calcium targets set for you
- Cooking for one or for four, shopping lists by aisle
12 questions, then see day 1 free before you pay. 30-day money-back guarantee.
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Strength plan · $27 one-time
A 12-week strength plan built for your stage
- Two or three sessions a week, 30 to 45 minutes
- Home with no equipment, bands and dumbbells, or a gym
- Adjustments for sore knees, backs, shoulders, leaks and bones
- Walking targets, strength tests and a progress log
Six questions, then see week 1 free before you pay. 30-day money-back guarantee.
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What the guidelines say
Common Misconceptions vs. Published Evidence
Perimenopause is identified mainly from symptoms and cycle changes. Below is what the published documents say about three frequent misconceptions.
Frequent Misconception
Published Guidance
Misconception 01 · Lab Testing
“A normal blood hormone test means you are not in perimenopause.”
Hormone levels move from cycle to cycle, so one result can fall in the normal range.
Evidence-Based Guidance
At 45 or over, NICE identifies perimenopause from symptoms and cycle changes, without lab tests.
NICE NG23 (1.3.1) says to identify perimenopause in otherwise healthy people aged 45 or over from recently started vasomotor symptoms and any change in the menstrual cycle, without laboratory tests. It limits an FSH test to people aged 40 to 45 with symptoms and a cycle change, or under 40 when menopause is suspected (1.3.6). STRAW+10 describes FSH in the late transition as sometimes in the menopausal range and sometimes in the range of the earlier reproductive years.
What a home menopause test can and can't tell you →Misconception 02 · Timing
“You must wait until periods stop entirely before addressing symptoms.”
Symptoms that start while periods continue are easy to dismiss.
Evidence-Based Guidance
Perimenopause starts while periods continue.
STRAW+10 places the start of perimenopause at the early menopausal transition (stage −2), when the length of consecutive cycles first differs by 7 days or more, and its end 12 months after the final period. NICE NG23 (1.3.1) identifies perimenopause from recently started vasomotor symptoms and any change in the menstrual cycle. Neither requires periods to have stopped.
Misconception 03 · Age Threshold
“Under age 45 is too early to have perimenopausal changes.”
Symptoms in the late 30s or early 40s are easily put down to stress.
Evidence-Based Guidance
Symptoms are reported well before 45.
In a US survey of 4,432 people aged 30 and older, 55.4% of those aged 30–35 fell into the moderate or severe category on the Menopause Rating Scale. That counts symptoms, not perimenopause. For people aged 40 to 45 with symptoms and a change in their cycle, NICE NG23 (1.3.6) allows an FSH test to help confirm menopause.
How staging worksSee the full stage guide →
The stages of the transition
Doctors use an international framework (STRAW+10) to describe where you are in the years around the final period — based on your cycles, not a single blood test.
Early
Early perimenopauseCycles start to vary by a week or more between periods.
Late
Late perimenopause60 days or more without a period.
Menopause
Final periodConfirmed after 12 months with no period.
Perimenopause0 · final period
avg. age 52
avg. age 52
- −5 to −3Reproductivevariable
- −2Early transitionvariable
- −1Late transition1–3 years
- +1Early postmenopause5–8 years
- +2Late postmenopauserest of life
Find your stage · 2 min →Stages and durations: Harlow et al., 2012. Average age at menopause in the US: Office on Women's Health
How we source
Every figure on this page links to the document it comes from
Stage criteria and guidance follow the 5 documents below. Last updated: November 2026.
- • NICE guideline NG23: Menopause, identification and management
- • STRAW+10: Stages of Reproductive Aging Workshop, Fertil Steril 2012
- • Cunningham et al., Perimenopause symptoms in the US, npj Women's Health 2025
- • Hedges et al., Mayo Clinic and Flo survey, Menopause 2026
- • Office on Women's Health: Menopause basics