Menopause isn't a single day on the calendar — it's a transition that unfolds over years. Understanding which stage you're in helps you make sense of what your body is doing, and why symptoms can feel so unpredictable.
Perimenopause is the run-up. It often begins in your 40s — sometimes earlier — and can last several years. The defining feature is that hormones, especially oestrogen, start fluctuating rather than declining smoothly. That's the reason symptoms come and go: one month you feel like yourself, the next the hot flushes and broken sleep return. Periods usually become irregular in timing, flow, or both. This is the stage where most women first notice change, and also the stage most often dismissed — because on paper the periods are 'still there.'
Menopause itself is a single point, reached when you've gone 12 months in a row with no period. Most women reach it in their late 40s or early 50s. Because it's defined by a full year of absence, it's diagnosed looking backward — you only know the date once the year has passed. There's no single blood test that reliably pins it down during perimenopause, because the fluctuating hormones make one-off readings unreliable.
Postmenopause is everything after that point. For many women the vasomotor symptoms — hot flushes and night sweats — ease over the following years. But oestrogen stays low, and that has longer-term effects on bone, heart, and vaginal tissue that are worth managing proactively rather than waiting for a problem. This is the stage where the habits you build — strength training, enough protein and calcium, not smoking — pay the biggest dividends.
A note on tracking. Doctors have traditionally staged menopause using menstrual-cycle changes (a system called STRAW+10). But recent research suggests this approach can miss women who have regular cycles yet are already deep in symptoms — as well as women on hormonal contraception or who've had certain procedures that mask their periods. The practical takeaway is liberating: your symptoms count, even if your periods still look 'normal.' You don't have to wait for your cycle to fall apart before taking what you're feeling seriously.
Wherever you are in the three stages, the same foundations help: moving your body, eating to protect muscle and bone, protecting your sleep, and having a doctor who takes your experience seriously.
This is general information, not personal medical advice. If you have a health condition, or aren't sure whether an exercise is right for you, talk to your own doctor.