Perimenopause Symptoms NZ: What's Normal in Your 40s

By Dr Roderick Mulgan, NZ GP and founder of Lifeguard Health.

Most women don’t arrive at perimenopause with a diagnosis. They arrive with a list: sleeping badly, warmer than everyone else in the room, short-tempered in a way that doesn’t feel like them, and periods that have quietly stopped behaving. It takes a while before anyone joins the dots. If you’re a NZ woman in your 40s and something feels off, this is for you.

What perimenopause is (and isn’t)

Perimenopause is the run-up to menopause — the years during which your ovaries gradually wind down. For most NZ women it begins in the early-to-mid 40s. Hormone levels (oestrogen and progesterone in particular) start to fluctuate, sometimes wildly, and the symptoms reflect that fluctuation rather than a steady decline.

That’s an important point: in perimenopause, hormones don’t simply drop. They lurch. That’s why a woman in her early 40s can have a textbook month followed by a month where everything feels off, then a month somewhere in between.

Menopause itself is the point at which you’ve gone 12 months without a period. In NZ the average age is around 51. Everything in the years leading up to that — sometimes 8–10 years of it — is perimenopause.

Perimenopause symptoms, grouped by what they actually feel like

You will see “the 34 symptoms of perimenopause” quoted online. The number is arbitrary and the list is long enough to worry anyone. It’s more useful to group them — and to keep in mind that no one gets all of them. Most women experience a handful, and some barely notice the transition at all.

Cycle changes. Periods becoming heavier, lighter, longer, shorter or unpredictable; more cramping; spotting between periods. Worth knowing: you can still get pregnant during perimenopause, so contraception remains relevant through the transition.

Temperature. Hot flushes and night sweats — and yes, these can start years before periods stop. They affect women very differently: some barely notice them, others find them disruptive enough to want help.

Sleep. Waking at 2–3am with a busy mind is one of the most common complaints, and one of the least discussed. Night sweats explain some of it; falling progesterone explains more. Poor sleep then colours almost everything else on this list, which is why it’s usually the first thing worth addressing.

Mood and thinking. Irritability and a shorter fuse, anxiety that doesn’t feel like “you”, low mood, and the brain fog so many women describe — missing names, losing the thread, forgetting why you walked into the kitchen. This is real and hormonally driven. It is also, for most women, temporary.

Body. Joint aches and stiffness, especially in the mornings. Muscle aches, headaches or worsening migraine, tender breasts, thinning hair, drier skin, vaginal dryness, lower libido, and weight changing distribution — particularly around the middle.

Energy. Persistent tiredness that sleep doesn’t fully fix.

A long list like this can read as alarming, and it shouldn’t. Perimenopause is a normal physiological transition that happens to have a wide symptom footprint. You don’t need all of these for it to be perimenopause, and you don’t need any of them to be “significant” in a textbook sense. If your life has shifted and the timing fits, the timing fits — and if any of it is affecting your daily life, that’s a straightforward conversation to have with your GP.

What actually helps

The honest answer is: a combination of things, in this rough order.

1. Sleep

If sleep collapses, everything else gets harder. Protect a regular bedtime, get morning light, watch alcohol (which fragments sleep more in your 40s than it did in your 30s), and consider a melatonin-free sleep supplement. Melatonin is prescription-only in NZ, so a non-prescription nightly product like Lifeguard Sleep is often the practical answer.

2. A daily nutritional foundation

Don’t try to fix perimenopause with a cupboard full of supplements. The nutrients most worth checking in your 40s are vitamin D (often low in NZ over winter), iron (especially if your periods are heavy) and omega-3 if you rarely eat oily fish — ideally guided by a blood test rather than guesswork. Then choose one simple daily base, and check the form and dose of every active ingredient on the label.

3. Strength training

Two to three sessions a week of resistance training is the single most useful intervention for bone density, muscle preservation, glucose handling and mood in perimenopausal women. You don’t need a gym — bodyweight, bands, and a couple of dumbbells will do.

4. A frank conversation with your GP about HRT

If hot flushes, sleep or mood are significantly affecting your life, HRT (often called MHT — menopausal hormone therapy) is worth a properly informed conversation. The 2002 Womens Health Initiative study scared a generation of women off HRT; the picture in 2026 is much more nuanced, and for many women in their 40s and early 50s the risk profile is favourable. Talk to a NZ GP who keeps up with menopause care.

5. Don’t skip the basics

Iron is commonly low in perimenopausal women with heavy periods — ask for a blood test if you’re tired, breathless on stairs, or pale. Thyroid problems also become more common in this age group, and they look a lot like perimenopause. Get the obvious things ruled out.

What I’d be wary of

Any product that promises to “balance your hormones”, “reverse perimenopause” or replace medical advice. Be cautious of bioidentical-hormone compounding clinics that operate outside mainstream care. Be cautious of expensive bespoke supplement protocols that aren’t supported by evidence. And be cautious of anyone telling you perimenopause is something you should just push through.

Frequently asked questions

What are the first signs of perimenopause?

Usually a change in your menstrual cycle — periods becoming shorter, longer, heavier, lighter or irregular — rather than hot flushes. Disrupted sleep, mood changes and joint aches often appear early too.

When does perimenopause start in NZ women?

Most commonly in the early-to-mid 40s. Some women start earlier, in their late 30s, particularly if their mother went through menopause early.

How long does perimenopause last?

Anywhere from a few years to a decade. The average is around 4–7 years.

Can I get a blood test to confirm perimenopause?

Hormone blood tests can be unhelpful in perimenopause because levels fluctuate so much. NZ guidelines generally don’t recommend FSH or oestrogen testing to diagnose perimenopause in women over 45 — symptoms are the diagnosis.

How do I know perimenopause is ending?

Periods become further apart and then stop. Menopause is confirmed after twelve consecutive months without a period. Symptoms often ease after that, though some — vaginal dryness in particular — can persist and are worth raising with your GP.

What supplements help with perimenopause?

Start by checking vitamin D and iron with your GP, eat oily fish or consider an omega-3, and make sleep support the next priority. Our NZ GP’s guide to menopause supplements sets out the full picture, including what the evidence supports and what to skip.

Should I just take HRT?

HRT is worth considering for many women, especially if symptoms are significantly affecting your life. It’s not the right call for everyone — have the conversation with a NZ GP who knows menopause well, weigh the personal pros and cons, and make a decision from there. Supplements and HRT aren’t mutually exclusive.

If you take one thing from this article

You don’t need to white-knuckle perimenopause. The combination of sensible daily nutrition, protected sleep, strength training, and an informed conversation with your GP will get most NZ women in their 40s through this transition in much better shape than soldiering on alone.

Read the full NZ guide to menopause supplements →

This article is general information for NZ adults 45+ and is not a substitute for personal medical advice. If you’re unsure what’s right for you, speak to your GP. Dr Roderick Mulgan is a NZ general practitioner and the founder of Lifeguard Health.