Perimenopause vs. Menopause: What's the Difference

Perimenopause and menopause are often used interchangeably, but they describe two different stages of the same transition. Knowing which stage you’re in can help you make sense of your symptoms and know what to ask a clinician.

What is perimenopause?

Perimenopause is the transitional period leading up to menopause, when hormone levels start to fluctuate and periods become less predictable. It can start in your late 30s to mid-40s and typically lasts several years, though the length varies widely from person to person. Symptoms during this stage often include irregular periods, hot flashes, night sweats, mood changes, and sleep disruption, even though you’re still having periods.

What is menopause?

Menopause is a single point in time, reached once you’ve gone 12 consecutive months without a period. The average age is 51 in Canada, though it varies. After that point, you’re considered postmenopausal. Many of the same symptoms from perimenopause (hot flashes, sleep changes, mood changes) can continue into this stage for some people, while others notice them ease.

Why the distinction matters

The stage you’re in can affect what a clinician looks at. During perimenopause, periods are still happening, just irregularly, which can make it harder to know what’s a normal fluctuation versus something worth checking. Once you’re in menopause, the absence of periods itself is the defining marker, so the conversation shifts to managing ongoing symptoms and longer-term health considerations.

If you’re noticing symptoms and aren’t sure which stage you’re in, that’s a normal question to bring to a clinician rather than something you need to self-diagnose. Jill Health’s online menopause care covers both stages: you can read more in our guide to online menopause care, hormone therapy, costs and coverage in Canada.

Frequently asked questions

Can you get pregnant during perimenopause? Yes. Ovulation becomes irregular but doesn’t stop immediately, so contraception is still relevant until you’ve reached menopause if you want to avoid pregnancy.

How long does perimenopause last? It varies, commonly a few years, though for some people it can be shorter or longer.

Sources: Society of Obstetricians and Gynaecologists of Canada; Menopause and U patient resources.