Early Signs of Perimenopause: The First Symptoms to Watch For
The earliest signs of perimenopause — usually in your late 30s or early 40s — and how to know when it's time to act.
Rebecca Rumsey, MSc, RD
Early Signs of Perimenopause
The classic image of perimenopause is hot flashes and missed periods. But the earliest signs usually arrive years before that — and they're often dismissed as stress, age, or 'just me.'
The earliest signs
- Cycle length changes — even 2–3 days shorter or longer is a signal
- PMS getting worse — heavier mood swings, more bloating
- Sleep changes — waking at 2–4am, harder to get back to sleep
- New anxiety — especially if you've never had it
- Brain blips — walking into a room, forgetting names mid-sentence
- Heavier or lighter periods
- New food sensitivities — bloating from things you used to tolerate
- Weight creeping up with no obvious cause
- Energy crashes in the afternoon
When does early perimenopause start?
Most commonly late 30s to early 40s. Anyone can experience earlier onset; if you have premature ovarian insufficiency (POI) — symptoms under 40 — it warrants medical assessment.
What to do early
- Start tracking now — even a year of data is gold when you talk to a clinician
- Strength training — this is your bone and muscle insurance for 30 years
- Protein audit — most women are short by 20–40g daily
- Sleep hygiene — protect this fiercely
- Find a clinician who actually understands midlife women's health
Want a perimenopause coach that does this work for you? Lila tracks 20+ symptoms, identifies your trigger foods through photo meal logging, and adapts your plan as your hormones shift — designed by Rebecca Rumsey, MSc, RD.
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