Perimenopause vs menopause: which am I in?

The definition nobody gives you

Menopause is one day: the twelve-month anniversary of your last period. Before that day, everything is perimenopause. After it, post-menopause. That's the whole map, and almost nobody is handed it.

Perimenopause commonly begins in the early-to-mid 40s, sometimes earlier, and this is the part that matters: it usually starts while periods are still regular. Hormones fluctuate long before they decline. The waves come before the tide goes out.

The regular-periods myth

"My periods are still regular, so I can't be perimenopausal" keeps more women from answers than any other sentence. It also lives behind many a GP's "you're too young". Cycle change is often a later feature; sleep, mood, temperature and thinking often shift first.

So don't gatekeep yourself. If several things feel unlike you at once, in your 40s, that pattern deserves the word "perimenopause" in the conversation, whoever brings it up first.

Finding your place on the map

No blood test reliably rules perimenopause in or out at this age: hormones swing too much day to day for a single reading to mean much (NICE guidance says diagnosis in over-45s should be based on symptoms, not tests). Your pattern over weeks is the evidence.

Two free ways to see your own pattern: the 2-minute quiz maps where you might be and why, and the symptom diary builder turns two ordinary weeks into the kind of record clinicians take seriously.

Sources and further reading: NHS: Menopause · NICE NG23 · Women's Health Concern. General information, not medical advice. If your symptoms concern you, speak to your GP.