Posted on August 25, 2026July 25, 2026 by Stephen Brumwell

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Perimenopause is the transition before menopause, when ovulation becomes less consistent and hormone patterns become more unpredictable.
Oestrogen does not simply decline in a straight line. It can rise and fall from month to month, while progesterone often becomes lower or less reliable because ovulation is less consistent.
This shifting oestrogen/progesterone pattern can explain why symptoms feel random: heavier bleeding, breast tenderness or irritability in one cycle, then hot flushes, night sweats, vaginal dryness or poor sleep in another.
FSH and LH are brain messenger hormones that try to keep the ovaries responding. Because the ovaries respond less predictably during perimenopause, these markers can also fluctuate.
The first clue is often a period change, but symptoms can also include sleep disruption, anxiety, brain fog, fatigue, libido changes, vaginal dryness, joint pain and body composition changes.
A single hormone blood test often does not tell the full story. Symptoms, cycle history and broader health markers usually give more useful context.
The best support plan looks at the whole system: sleep, stress, nutrition, blood glucose, muscle, bone health, alcohol intake, medications, medical history and whether MHT or other treatments are appropriate.

Perimenopause feels like your body has changed the rules without telling you.

One month your cycle is predictable, the next, your period is early, late, heavier, lighter, or missing altogether.

Your sleep becomes lighter, anxiety is louder, and you notice brain fog, night sweats, low libido and intolerance to stress.

This all being said, Perimenopause is a normal part in the transition into menopause.

In this article, we’ll unpack further what perimenopause is. We’ll discuss the stages from perimenopause into menopause, how it affects quality of life and some tips of what we can do manage it.

What Is Perimenopause?

Perimenopause is the transition leading up to menopause.

Women are considered to have reached menopause once you have gone 12 months without a period, assuming there is no other medical reason for the bleeding change.

Perimenopause is the lead-up to that point, when ovarian function becomes less consistent and hormone patterns become more variable.

A Simple Way to Understand Oestrogen and Progesterone

Two key hormones involved in this transition are oestrogen and progesterone.

Oestrogen is often thought of as the hormone that supports the first half of the menstrual cycle. It helps build the uterine lining, supports vaginal and urinary tissues, influences mood, temperature regulation, skin, bones, blood vessels and brain function.

Progesterone is mainly made after ovulation. It helps balance the second half of the cycle, supports a calmer nervous system, helps regulate bleeding patterns and can influence sleep, mood and fluid retention.

During perimenopause, oestrogen does not simply fall in a straight line. It can rise and fall unpredictably. Progesterone often becomes lower or less consistent because ovulation becomes less reliable. This can create a feeling of hormonal imbalance: some months may feel like high-oestrogen symptoms, such as heavier bleeding, breast tenderness or irritability, while other months may feel more like low-oestrogen symptoms, such as hot flushes, night sweats, vaginal dryness or poorer sleep.

So when people say hormones are “declining,” it is only part of the story. Perimenopause is better understood as a time of fluctuating oestrogen and less reliable progesterone, before the lower-oestrogen pattern of menopause becomes more established.

When Does Perimenopause Affect Women?

Perimenopause usually begins between ages of 45 to 56 years of age and may last around 4 to 8 years (Peacock & Ketvertis, 2023). Some women move through it with minimal disruption. Others have symptoms for years.

A better way to think about the whole picture is in phases:

Early perimenopause: cycles may still come regularly, but they start to change. The luteal phase may shorten, PMS may worsen, sleep may become more fragile, and breast tenderness or heavier bleeding may appear.
Mid perimenopause: cycles become more obviously variable. Ovulation may be inconsistent, bleeding can become heavier or less predictable, and symptoms such as hot flushes, night sweats, anxiety and brain fog can become more noticeable.
Late perimenopause: cycles may be more than 60 days apart. Oestrogen may be lower more often, FSH may trend higher, and classic menopause symptoms may become stronger.
Menopause and postmenopause: menopause is reached after 12 months without a period. Postmenopause is the stage after that.

The First Sign = Period Changes

Usually, the most reliable clue we see to determine perimenopause is changes in your menstrual cycle.

Of course, there are many other reasons why your cycle could be irregular, but this is often the first clue, assuming you’re within the age range (or close to it).

Common menstrual cycle signs include periods becoming irregular, shorter or longer than usual, lighter or heavier than usual, or absent for a few months (Jean Hailes for Women’s Health, 2026.).

Some examples include:

cycles becoming shorter, sometimes 25 days or less
cycles becoming longer or more spread out
heavier bleeding than usual
lighter bleeding than usual
spotting or unpredictable bleeding
more painful periods
worse PMS, breast tenderness or irritability
occasional skipped periods

One common trap is assuming perimenopause only starts when periods become very irregular, but symptoms can start when cycles still look fairly regular.

While again, a lot of things can contribute to cycle irregularity (such as busy life, high stress or poor diet), it can be easily to blame these and overlook perimenopause all together.

The Unpredictable Nature of Hormones in Perimenopause

Perimenopause is not simply a smooth decline in oestrogen.

Oestrogen fluctuates. Progesterone often becomes less consistent as ovulation changes. Follicle-stimulating hormone (FSH) and luteinising hormone (LH) can also shift as the brain tries to keep the ovaries responding. Some cycles are ovulatory. Some are not.

FSH and LH are messenger hormones from the brain. FSH helps stimulate follicles in the ovaries, while LH helps trigger ovulation. During perimenopause, the ovaries may not respond as predictably as they once did, so the brain can send stronger or more variable signals. This is one reason FSH can look higher in one cycle and lower in another, and why a single blood test may not tell the full story (Hechtman, 2025)..

This leads to some months feeling almost normal, then the next month you feel completely derailed.

This is also why perimenopause can feel a little bit random, because you can have:

a normal-looking period but poor sleep
heavy bleeding and breast pain one month, then a skipped period later
anxiety without hot flushes
brain fog before obvious cycle disruption
night sweats mainly before your period

Common Perimenopause Symptoms

Perimenopause symptoms can be physical, emotional, cognitive, metabolic and sexual.

Common symptoms include:

hot flushes
night sweats
broken sleep or waking at 2-4 am
fatigue
headaches or migraines
breast tenderness
heavier or irregular bleeding
vaginal dryness
urinary urgency or recurrent irritation
lower libido
mood swings and low mood
anxiety or a reduced tolerance to stress
irritability or rage
brain fog
muscle aches or joint pain
changes in body composition
increased abdominal weight gain

Perimenopause and menopause affect women differently, with symptoms ranging from hot flushes and sleep problems to anxiety, brain fog and changes to mental health and wellbeing (Australian Government Department of Health, Disability and Ageing, 2026).

Progesterone Often Drops Before Oestrogen

One of the most useful things to understand is progesterone.

Progesterone is mainly produced after ovulation. If ovulation becomes less consistent, progesterone production can become less consistent too. You can still have oestrogen activity, but less progesterone to balance the second half of the cycle.

This can contribute to symptoms such as:

heavier bleeding
breast tenderness
worse PMS
anxiety
irritability
sleep disruption
night sweats
migraines
shorter cycles

Perimenopause is a time when cycles may still be present, but luteal phase changes and lower mid-luteal progesterone can contribute to poorer stress tolerance, anxiety, sleep disurbances, breast pain and heavier bleeding (Skilton, 2026).

In plain English: you may still be cycling, but the quality and rhythm of ovulation can change. When ovulation changes, progesterone changes. When progesterone changes, the nervous system often feels it.

Should I Do Hormone Testing?

Yes and no.

For most women in the expected age range, perimenopause is assessed through symptoms, age and cycle changes. Jean Hailes notes that if you are between 45 and 55, it is not usual for a doctor to measure hormone levels to diagnose perimenopause; symptoms and period changes are usually more useful (Jean Hailes for Women’s Health, 2026).

That can be frustrating if you want a clear answer from a blood test. But it makes sense clinically. FSH, oestradiol and progesterone can vary across the cycle and across different months. A single blood test might catch one moment, not the whole transition, a blood test can be almost useless.

Testing may still be useful when:

symptoms start early (Much further before age 45)
periods stop much earleir too.
Strange, unusual or severe symptoms that are ongoing
bleeding is heavy, prolonged or unpredictable
pregnancy is possible
thyroid disease, iron deficiency, B12 deficiency, vitamin D deficiency, diabetes or other conditions need to be ruled out
there is a history of chemotherapy, radiotherapy, ovarian surgery or hysterectomy

A better approach for hormone testing is actually through dried urine, saliva and serum testing, often known as a DUTCH test.

This usually involves multiple collection across a 24-hour period to better understand sex and adrenal hormonal patterns, which can often better help the clinical picture (Hechtman, 2025).

Heavy Bleeding and Perimenopause

Some bleeding changes are common in perimenopause. That does not mean all bleeding changes are harmless.

Always speak to your GP if you experience the following over a consistent basis:

very heavy bleeding
bleeding that lasts longer than usual
bleeding between periods
bleeding after sex
bleeding after menopause
pelvic pain
unexplained weight loss
dizziness, faintness or symptoms of iron deficiency

Healthdirect recommends medical review if perimenopausal symptoms are bothering you or affecting daily life, and specifically flags heavy bleeding, bleeding between periods and bleeding after sex as reasons to see a doctor (Healthdirect, n.d.).

Heavy bleeding can also contribute to low iron, which can worsen fatigue, breathlessness, restless legs, poor exercise tolerance, hair shedding and low mood. If bleeding has changed significantly, iron studies are often worth discussing.

The Stress Picture

Perimenopause and the ovaries have a substantial link to the brain and nervous system.

The hypothalamic-pituitary-ovarian (HPO) axis is the communication loop between the brain and ovaries. The hypothalamic-pituitary-adrenal (HPA) axis is the communication loop between the brain and adrenal stress response. These systems are connected. Sleep loss, under-eating, overtraining, psychological stress, alcohol, blood sugar swings and chronic illness can cause dysregulation across both these systems.

This point is critical, because often perimenopause symptoms are worsened because when our HPO/HPA Axis is burdened by these factors.

Symptoms such as feeling tired but wired, extreme insomnia or very poor stress resilience become amplified.

Sleep, stress management, circadian rhythm, nutrition and movement are core foundations for supporting the HPA/HPO axis, which in return supports an easy transition into menopause (Skilton, 2026).

The takeaway: If your sleep is broken, your blood glucose is swinging, your caffeine is high, your alcohol intake is creeping up and your training is either too intense or non-existent, perimenopause may feel much worse than it needs to.

Food and Perimenopause

There is no single perimenopause diet, yep, I said it.

There is more key factors to consider when going through perimenopause to implement into (or out of) your current diet.

Some core examples include:

enough protein at each meal (This will support your mood, hormones and nervous system in general)
fibre-rich carbohydrates such as vegetables, legumes, oats, wholegrains, fruit and root vegetables where tolerated (Think gut health, which also supports mood!)
healthy fats from olive oil, avocado, nuts, seeds, eggs and oily fish
eat regular meals and do not skip them, this will worsen your anxiety and cravings
regular meals if skipping food worsens anxiety, cravings or night waking
Eat enough food in general, especially if you are highly active or training intensively
reduced alcohol if sleep, hot flushes, mood or weight gain are concerns
reduce ultra-processed foods, this increases inflammation and worsens symptoms

If you want it in basic terms, the best approach is eating adequate protein, quality carbohydrates and fat, and limit aggressive dieting.

Protein supports blood glucose stability, thyroid health, lean mass and the amino acid supply needed for hormone-related processes. Carbohydrates can matter too, because low energy availability and low glucose availability may affect LH signalling and ovulation in susceptible women (Skilton, 2026).

This is pretty important. Many midlife women I see respond to body changes by eating less, fasting a lot and pushing 110%. You might move the needle a little bit, but usually, this worsens sleep, stress hormones, cravings and cycle disruption.

For related reading:

Movement and Perimenopause

Perimenopause is a key time to protect muscle and bone, and we can do this through movement.

I know we’re not all on the same level when it comes to exercise motivation, but perimenopause is a pinnacle time where changes happen (and movement becomes important).

Oestrogen changes can affect bone turnover, connective tissue, joint comfort, insulin sensitivity and where body fat is stored. RACGP notes that menopause is associated with reduced bone mineral density and changes in cardiovascular risk factors such as increased central adiposity (Magraith & Jang, 2026).

Research also suggests late perimenopause may be a vulnerable period for skeletal muscle loss. Park et al. found appendicular lean mass was lower in late compared with early perimenopausal women, with FSH proposed as one possible contributor (Park et al., 2020).

Some simple tips to think of movement in your daily routine:

Move often and daily, on the hour every hour is good if you have an office job
Walk after your lunch break to support healthy blood sugar regulation
If possible, incorporate light weights or bodyweight training 20-30 minutes, 2-3 times a week.
If difficult, find one single addition you can sustain and repeat daily. This could be just 10-15 minutes of walking, anything extra counts.
support vitamin D and calcium status where needed
address sleep and alcohol intake
avoid long periods of under-eating
treat pain or injury properly so you can keep moving

Of course, when it comes to bone, we also need to consider our vitamin D and calcium status, and avoid long periods of under-eating.

Sleep and Perimenopause

Poor sleep can make almost every perimenopause symptom feel worse.

Night sweats can wake you. Anxiety can wake you. Alcohol can fragment sleep. Low blood glucose overnight can wake some people. Stress can make the nervous system more alert when it should be downshifting.

This often flows into the next day, making everything louder, cravings worsen, and mood less steady.

You tend to then drink more coffee, become susceptible to poor food choices, and the list goes on.

So, it’s always good to have a sleep plan to mitigate some of the effects, and support your nervous system as best you can.

Of course, other tailored treatment plans, supplements and herbal medicine can help here too (book a free discovery call to learn how).

Some realistic tactics to support your nervous system (and sleep) might include:

10-15 minutes morning sunlight to better regular your circadian rhythm
Setting a consistent wake and bed time (while limiting phone use)
caffeine before midday
enough food during the day (esp. protein!)
alcohol reduction, especially close to bedtime
a cooler bedroom
A sleep wind down ritual (maybe it’s a tea and reading before bed).

For deeper sleep context, see Sleep Hygiene: What It Is and How to Build Better Sleep Habits and Morning Sun and Circadian Rhythm: Why Light Timing Matters for Sleep, Energy and Mood.

Where Does MHT Fit?

Menopause hormone therapy, or MHT, can be very helpful for some women.

It is not the only option, and it is not automatically suitable for everyone. But it should not be dismissed out of fear either.

RACGP notes that MHT can be offered to symptomatic women where there are appropriate clinical indications and no contraindications, after an individualised discussion about risks and benefits (Magraith & Jang, 2026). It may help symptoms such as hot flushes, night sweats, sleep disturbance and genitourinary symptoms, and it can also have a role in bone health for some women.

The decision depends on your symptoms, age, menstrual stage, uterus status, bleeding pattern, migraine history, cardiovascular risk, clotting history, breast cancer risk, liver health, medications and personal preferences.

This is something you can discuss with your GP, but not something helped with naturopathically. Of course, if you are going through MHT, we can support alongside.

A Practical Start to Perimenopause

If you suspect perimenopause, start with a simple three-month snapshot.

Track the following if you can:

cycle length, bleeding volume and duration
night sweats or hot flushes (frequency per week, severity)
sleep quality (frequency, wake times, time to fall asleep)
mood and anxiety
migraines or headaches
breast tenderness
libido and vaginal symptoms (dryness, sex drive)
joint pain or muscle aches
training tolerance
Stress load and tolerance

Useful blood tests to discuss with your GP may include iron studies, thyroid function, fasting glucose or HbA1c, lipids, vitamin D, B12 and other markers depending on your history. Hormones may be tested in some cases, but they are not always the first or most useful step.

This data is so useful for you to bring to a naturopathic consultation too. While we would generally ask questions like this during a consultation, this level of detail gives us much better insight as to what is going on, and allows us to support you better.

Also Consider Some Foundations

Eat more regularity and ensure your meals are protein rich
lift weights two to three times per week, or just increase movement in general
Incorporate an evening sleep ritual (limit screen, drink a tea and read a book)
Be kind to yourself and know that this process is a normal transition

The Takeaway

Perimenopause is a hormonal transition, but it is also a whole-body transition.

It can affect cycles, sleep, mood, cognition, libido, bleeding, muscle, bone, blood glucose, stress tolerance and body composition. The pattern can be messy because hormones fluctuate rather than decline in a straight line.

The best approach is not panic, guesswork or random supplements. It is pattern recognition, sensible testing, strong lifestyle foundations and individualised care.

If you want help making sense of your symptoms, nutrition, sleep, blood glucose, stress load or supplement options, Stephen can help you build a practical plan that fits your body, health history and stage of life.

FAQ

What are the first signs of perimenopause?

The first sign is often a change in your menstrual cycle. Periods may become shorter, longer, heavier, lighter, more painful or less predictable. Some women also notice sleep problems, anxiety, night sweats, breast tenderness, migraines or brain fog before their cycle changes dramatically.

Can perimenopause start before 45?

Yes, it can. However, if your periods become irregular or stop before 45, it is worth speaking with your GP. Early menopause and premature ovarian insufficiency need proper assessment.

Why do I feel anxious during perimenopause?

Hormone fluctuations can affect the brain and nervous system. Lower or less consistent progesterone, sleep disruption, stress load, blood glucose swings and life pressure can all contribute. Anxiety in perimenopause is common, but it should still be supported properly.

Do I need a blood test to diagnose perimenopause?

Not always. In the usual age range, perimenopause is generally assessed through symptoms, cycle changes and medical history. Blood tests can still be useful to rule out other causes of symptoms or to assess broader health markers. The better test is a DUTCH test.

Is heavy bleeding normal in perimenopause?

Heavier bleeding can happen in perimenopause, but it should not be ignored. See your GP if bleeding is very heavy, prolonged, occurs between periods, happens after sex or occurs after menopause.

Can nutrition help perimenopause symptoms?

Nutrition can help support energy, mood, blood glucose, muscle, sleep and long-term health. It may not remove every symptom, but adequate protein, fibre-rich carbohydrates, healthy fats and enough total food can make the transition easier for many women.

Should I take supplements for perimenopause?

It depends on your symptoms, health history, medications and goals. Magnesium, creatine, zinc, herbs and other supports may be useful in selected cases, but they should be chosen carefully rather than taken randomly. Book a naturopathic health consultation first and ensure your supplements or herbals are tailored to you.

Is MHT safe?

MHT can be appropriate and helpful for many symptomatic women, but suitability depends on individual risk factors and medical history. Speak with your GP or a menopause-aware doctor to discuss benefits, risks and options.

References

Australian Government Department of Health, Disability and Ageing. (2026). Delivering the first national menopause campaign for Australian women. https://www.health.gov.au/ministers/the-hon-mark-butler-mp/media/delivering-the-first-national-menopause-campaign-for-australian-women

Forbes, S. C., Candow, D. G., Krentz, J. R., Roberts, M. D., & Young, K. C. (2021). Creatine supplementation in women’s health: A lifespan perspective. Nutrients, 13(3), 877. https://pmc.ncbi.nlm.nih.gov/articles/PMC7998865/

Healthdirect. (n.d.). Perimenopause. https://www.healthdirect.gov.au/perimenopause

Hechtman, L. (2025). Supporting patients through perimenopause: EndoMAP Code 1501. Seminar handout. NutriPATH.

Menopause: Symptoms, Causes And Management | Jean Hailes. (2026). In Jean Hailes. https://www.jeanhailes.org.au/health-topics/menopause/

Magraith, K., & Jang, C. (2026). Demystifying menopausal hormone therapy prescribing. Australian Journal of General Practice, 55(4). https://www1.racgp.org.au/ajgp/2026/april/demystifying-menopausal-hormone-therapy-prescribin

Park, Y. M., Jankowski, C. M., Ozemek, C., Hildreth, K. L., Kohrt, W. M., & Moreau, K. L. (2020). Appendicular lean mass is lower in late compared with early perimenopausal women: Potential role of FSH. Journal of Applied Physiology, 128(5), 1373-1380. https://pubmed.ncbi.nlm.nih.gov/32298212/

Peacock, K., & Ketvertis, K. M. (2023). Menopause. In National Library of Medicine. StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK507826/

Prior, J. C. (2006). Perimenopause lost: Reframing the end of menstruation. Journal of Reproductive and Infant Psychology, 24(4), 323-335. https://doi.org/10.1080/02646830600974071

Skilton, A. (2026). The menopausal transition: A four-phase framework for HPA/HPO axis support. Clinical webinar handout. Designs for Health.