Perimenopause is the transitional phase leading up to menopause. It's when oestrogen and progesterone levels begin to fluctuate and decline — sometimes gradually, sometimes dramatically — and it can begin as early as the mid-30s, though most commonly in the early to mid-40s.
How Long Does It Last?
On average, perimenopause lasts four to eight years, though for some women it extends to a decade. Menopause itself — the actual point of the final period — isn't confirmed until 12 months have passed without one. Everything before that confirmation is perimenopause.
This is critical context for men. What your partner may be experiencing in her early 40s — irregular periods, mood shifts, disrupted sleep, changes in energy — may have a clinical explanation she hasn't yet named or discussed.
What Perimenopause Looks Like
Symptoms vary widely but commonly include: irregular menstrual cycles (longer, shorter, heavier, or lighter than usual), hot flushes and night sweats, sleep disruption, irritability and mood swings, reduced libido, vaginal dryness, brain fog, and increased anxiety.
The unpredictability of perimenopause is one of the most disorienting aspects — for her and for the people around her. Symptoms can appear suddenly, disappear for months, and return with different intensity.
Why It's Often Missed
Many women (and their partners) mistake perimenopause symptoms for stress, depression, thyroid issues, or simply "getting older." GPs sometimes do too. The average time between symptom onset and diagnosis is longer than it should be, partly because the symptoms overlap with so many other conditions.
If your partner is in her 40s and experiencing any combination of the symptoms above — and has been for some time — perimenopause is worth a conversation with her doctor.
What You Can Do
You don't need to diagnose anything. What helps is awareness: knowing that perimenopause exists, that it can begin earlier than most people expect, and that the changes you're observing in your partner may have a physiological cause rather than a relational one. That shift in interpretation alone — from "she's different lately" to "she may be in perimenopause" — changes everything about how you respond.
Understanding this is the first step. Sharing it with someone who needs it is the second.
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