The Signs of Perimenopause — Including the Ones Nobody Warns You About

← Back to Learn · By Kathryn Carter · Last updated: 16 August 2026

Most women don't arrive at perimenopause because of hot flushes. They arrive because something feels off and they can't name it.

Sleep changes. A shorter fuse. Periods that are three days early, then eleven days late. A sense of not quite being yourself that doesn't match anything happening in your life.

Here's what to look for, roughly in the order it tends to show up.

The early signs, which are rarely the obvious ones

Your cycle changes character before it changes dramatically. A few days shorter. Heavier, or lighter. More clotting. A cycle that's always been 28 days becoming 25, then 31. This is usually the first objective sign, and it's easy to dismiss.

Sleep gets lighter. Often before night sweats. You wake at 3am, or you sleep through but wake unrefreshed.

You feel more reactive. More irritable, less resilient, more affected by things that wouldn't have registered. Often worse in the second half of the cycle.

Premenstrual symptoms intensify. PMS that was manageable for twenty years becomes harder work.

Energy drops. Not dramatic tiredness — a flatness that doesn't lift.

Recall slips. Words that won't come, walking into rooms. Real, common, and usually temporary.

The signs most people do associate with it

Hot flushes and night sweats. Vaginal dryness and discomfort. Joint aches. Changes in libido. Changes in skin and hair. Weight settling around the middle rather than the hips.

These tend to come later than the first group, which is why so many women spend a couple of years wondering what's going on before anything recognisable appears.

At 40 versus at 45

At 40, perimenopause is possible but less likely, and worth confirming rather than assuming. If your cycle has changed significantly before 45, see your GP — testing is more relevant at this age, and there are other things worth ruling out.

At 45, perimenopause is common and diagnosis is usually made on symptoms and cycle changes rather than blood tests. If the pattern above fits, it very likely is what you think it is.

Before 40, changes in cycle warrant a proper assessment. Premature ovarian insufficiency affects around 1% of women and is worth identifying early.

The things worth ruling out

This is the part that gets skipped, and it matters — because several conditions produce a very similar picture and all are more common in midlife.

Thyroid problems cause fatigue, weight change, mood change and cycle irregularity.

Iron deficiency causes fatigue, breathlessness and hair shedding, and heavy perimenopausal periods are a common cause of it.

Vitamin B12 and vitamin D deficiency both cause fatigue and low mood.

Depression and anxiety overlap substantially with perimenopausal mood change and deserve treatment in their own right.

Ask your GP for thyroid function, iron studies, B12 and vitamin D. It's a reasonable request, it's cheap, and being able to rule things out is worth a great deal.

"But I'm still getting periods"

Frequently said, and worth addressing plainly: you have periods throughout perimenopause. That's what perimenopause is — the years of change before your final period. You can be several years into it with a cycle that still arrives.

Menopause itself is diagnosed retrospectively, twelve months after your last period. More on what's happening hormonally.

When to see your GP

Book an appointment if symptoms are affecting your daily life, if you're under 45 with significant cycle changes, if bleeding is very heavy or between periods, if periods return after twelve months without one, or if low mood is part of it.

Two things worth knowing: menopausal hormone therapy is effective for many symptoms and the evidence has moved considerably in the last decade, so it's worth a current conversation. And you're entitled to be taken seriously. If you aren't, ask for another opinion.

Where MyPause fits

MyPause makes products for women through this transition, matched to what's actually bothering you.

• Sleep and 3am waking — Sleep Assist (AUST L 470087), which helps maintain and support healthy sleeping patterns and helps decrease, reduce and relieve disturbed and restless sleep
• Fatigue and low energy — Hormone Balance Plus (AUST L 470807), which relieves weariness, tiredness and fatigue in healthy individuals
• Cycle changes and night sweats — Hormone Balance Plus, which contains herbs traditionally used in Chinese medicine to help decrease, reduce and relieve night sweats associated with menopause, and to maintain, support and regulate a healthy menstrual cycle in peri-menopausal women
• Bone health — Women's Bone Support (AUST L 473195), with calcium, vitamin D3, vitamin K2 and hydrolysed collagen
• Skin changes — Women's Skin Support Plus (AUST L 473197)

Not sure where to start? Take the quiz.

Always read the label and follow the directions for use. If symptoms persist, talk to your health professional. Vitex agnus-castus may affect hormones and medicines such as oral contraceptives. Consult your health professional before use.

Common questions

How do I know if I'm in perimenopause?

Usually from a pattern rather than one symptom: cycle length or character changing, lighter or more broken sleep, feeling more reactive, and energy dropping. Over 45, diagnosis is generally made on symptoms and cycle changes rather than blood tests.

What are the first signs of perimenopause?

Cycle changes, lighter sleep, increased irritability and intensifying premenstrual symptoms usually come before hot flushes.

Can you be in perimenopause at 40?

Yes, though it's less common. If your cycle has changed significantly before 45, see your GP — testing is more useful at that age and other causes are worth ruling out.

Can you have perimenopause and still get your period?

Yes. Perimenopause is the years of change before your final period. Menopause is confirmed twelve months after your last one.

What else could it be?

Thyroid problems, iron deficiency, low B12 or vitamin D, and depression all produce a similar picture and are more common in midlife. Worth testing.

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