Most women learn about menopause in terms of one event, periods stopping. The physiological shift that produces menopausal symptoms, though, is rarely a single event. It’s a gradient that can begin in the late thirties and unfold over a decade, often with cycles that still look regular on paper.
That gradient is perimenopause. And the symptoms that show up in its early years can be easy to underestimate.
When does perimenopause actually start
The textbook answer used to be “in your late 40s.” Some clinical perspectives suggest that early physiological changes may begin earlier than traditionally recognised:
- Follicular changes and physiological fluctuations may begin 8 to 10 years before menopause (Harlow et al., 2012)
- The average age of menopause in Australia is 51, which puts early perimenopause commonly in the early 40s (Jean Hailes for Women’s Health, 2024)
- For some women, particularly those with a family history of early menopause, autoimmune thyroid disease, or surgical history, symptoms can begin in the late 30s
If you are wondering whether your symptoms could be related to early perimenopause, it may be worth exploring further with a clinician experienced in menopausal health.
What early perimenopause actually looks like
The textbook list (hot flushes, night sweats, missed periods) describes late perimenopause and menopause. Early perimenopause looks different and is much easier to miss:
Sleep changes. A specific pattern of waking at 2 or 3am wired and unable to get back to sleep, often without a clear trigger. Falling asleep is fine; staying asleep isn’t.
Cognitive changes. Word-finding difficulty, mid-sentence blanks, working memory drops. Many women describe it as “brain fog” but the experience is usually sharper than that, it’s the thing you’re trying to say falling out of reach.
New-onset anxiety. Anxiety that arrives in your 40s without a clear cause, particularly if you’ve never had an anxiety pattern before. Cyclical anxiety that worsens in the second half of your cycle is also common.
Cycle changes that aren’t dramatic. Cycles shortening from 28 to 25 days, or lengthening to 32. Periods becoming heavier, or noticeably lighter. Spotting before periods start. PMS arriving earlier in the cycle.
Joint pain and stiffness. Particularly morning stiffness, frozen shoulder presentations, and aches that move around. Some clinicians observe a possible link to physiological change, though this connection is still being studied.
Body composition shifts. Central weight gain despite no change in diet or exercise. Reduced exercise capacity at the same intensity.
Recurrent UTIs and vaginal dryness. These are commonly thought of as post-menopausal, but the genitourinary changes can begin years earlier.
Migraines or headache pattern changes. Cycle-related migraines can start, intensify, or change pattern in early perimenopause.
Why this can be difficult to identify
Early perimenopause can be difficult to identify for a few reasons:
- Cycles still look regular. Blood testing on day 21 of a cycle that’s still ovulating may return results within reference ranges, which can make the picture less clear.
- No single symptom looks definitive. Each symptom in isolation has many possible causes, so the pattern of overlapping symptoms is often more telling than any single one, which is why a clinical assessment looks at the whole picture. It can take time to surface a pattern.
- Menopausal therapy was discouraged for two decades following the Women’s Health Initiative study in 2002 (Rossouw et al., 2002). Current evidence, including reanalysis of WHI data and subsequent studies, indicates that the timing of menopausal therapy may affect its risk profile, with earlier initiation studied separately from the older WHI cohort (Hodis et al., 2016). If deemed medically appropriate, your clinician may discuss management options. These can include lifestyle advice, monitoring, referral, or treatment, and for some people no treatment is needed.
- The understanding of early perimenopausal changes continues to evolve. It may be worth exploring further with a clinician experienced in this area.
What’s worth doing
Some clinical perspectives suggest there may be value in assessing symptoms earlier rather than waiting (The Lancet, 2024). The starting point is a clinical assessment:
- A symptom and cycle history that maps the pattern over time, not a one-snapshot lab test
- Baseline pathology where it’s actually informative (thyroid panel, iron, B12, vitamin D, fasting metabolic markers)
- A clinical conversation about whether menopausal therapy is appropriate now, later, or not at all
- For women who can’t or don’t want to take menopausal therapy, evidence-based non-medication approaches including lifestyle, sleep, CBT, and certain medications
If deemed medically appropriate, your clinician may discuss management options. These can include lifestyle advice, monitoring, referral, or treatment, and for some people no treatment is needed. It’s not a single answer for every woman, and it’s not always the first step, but the conversation should be available, informed by current evidence, when symptoms are affecting your quality of life.
What it isn’t
Early perimenopause isn’t “stress.” It isn’t “just being a busy mum.” It isn’t proof that you need to push through. And it isn’t something to treat only when symptoms are severe enough that you can’t function.
If the pattern in this article is recognisable, a consultation with a clinician experienced in menopausal medicine may be worth considering.
This article is for general information only and should not replace individual clinical advice. Individual results vary based on your individual circumstances. Assessment findings do not guarantee a particular outcome.
Telehealth is not suitable for all health concerns. Your practitioner may recommend in-person assessment, urgent care, GP review, specialist referral, further investigation or no treatment depending on your circumstances.
References
- Harlow, S.D., et al. (2012). Executive summary of the Stages of Reproductive Aging Workshop + 10. Journal of Clinical Endocrinology & Metabolism, 97(4), 1159-1168. doi:10.1210/jc.2011-3362
- Jean Hailes for Women’s Health. (2024). Menopause. jeanhailes.org.au
- Writing Group for the WHI. Risks and benefits of combined menopausal therapy in healthy postmenopausal women. JAMA. 2002. doi:10.1001/jama.288.3.321
- Hodis HN, Mack WJ, et al. Vascular Effects of Early versus Late Postmenopausal Treatment with Estradiol (ELITE). N Engl J Med. 2016;374:1221-1231. doi:10.1056/NEJMoa1505241
- The Lancet. (2024). Menopause 2024 Series. doi:10.1016/S0140-6736(24)01291-2
