Perimenopause: Naturopathic Support for Changing Hormones, Cycles and Symptoms

What is perimenopause?

Perimenopause is the transition between your reproductive years and menopause.

It most commonly begins in the 40s, often around the mid-40s, although some women start noticing changes in their late 30s. And it isn’t necessarily a short transition. Perimenopause can continue for several years before your final period, commonly lasting around four to eight years.

During this time, the ovaries don’t simply stop working overnight.

Instead, ovulation gradually becomes less predictable. Some months you may ovulate normally, while in others ovulation may happen later or not at all. As this changes, the amount of oestrogen and progesterone your ovaries produce can also vary significantly from one cycle to another.

This is why perimenopause isn’t simply a time when your hormones become “low”.

Especially in the earlier years, oestrogen can sometimes rise higher than expected and then fall rapidly, while progesterone can become less consistent as ovulation becomes less reliable.

This can create a pattern that feels confusing from the outside. Your cycle may shorten for a few months, then suddenly become longer. PMS may become much stronger. Sleep can change, periods may become heavier or symptoms such as anxiety, headaches or hot flushes can seemingly appear out of nowhere.

Eventually, menstrual cycles become increasingly irregular until you reach menopause, which is defined as 12 months without a period.

But the journey to that point can look very different for every woman.

This is why I don’t look at one hormone result and ask whether your hormones are simply “high” or “low”. I look at how your cycle has changed, whether ovulation is still occurring consistently and what pattern your symptoms are following.

The pattern often tells us far more than one hormone result ever could.

What are the symptoms of perimenopause?

Perimenopause can affect the menstrual cycle, nervous system, sleep, temperature regulation, sexual health and metabolism.

Symptoms may include:

• • shorter, longer or more irregular cycles
  • heavier or lighter periods
  • worsening PMS or PMDD symptoms
  • hot flushes and night sweats
  • disrupted sleep
  • anxiety, irritability or low mood
  • brain fog and difficulty concentrating
  • headaches or migraines
  • breast tenderness
  • changes in libido
  • vaginal dryness or urinary symptoms
  • changes in body composition or weight

Not every woman experiences all of these, and the combination can change over time.

What is happening hormonally during perimenopause?

One of the earlier hormonal changes in perimenopause can be a shift in ovulation.

You may still be having regular periods, but that doesn’t necessarily mean every cycle is ovulating as consistently as it once did. As women move through perimenopause, anovulatory cycles become more common and progesterone production after ovulation can become less consistent.

This matters because progesterone is only produced in meaningful amounts after ovulation.

So if ovulation happens later, occurs less consistently or doesn’t occur at all, the normal rise in progesterone during the second half of the cycle can change too.

For some women, this is when familiar premenstrual symptoms begin to feel different. PMS may become stronger or last longer, sleep may become more fragile, breast tenderness may increase or periods may become heavier.

It doesn’t mean every symptom in perimenopause is caused by “low progesterone”.

But when symptoms begin changing before periods have become obviously irregular, I often want to know what is happening with ovulation rather than looking only at a single oestrogen result.

Sometimes the first hormonal clue in perimenopause isn’t that oestrogen has fallen. It’s that ovulation is no longer as consistent as it used to be.

Oestrogen can be high, low or rapidly fluctuating

Oestrogen behaves differently in perimenopause than many women expect.

Rather than steadily declining, oestrogen can become increasingly erratic. Some cycles may produce relatively high levels, while others are much lower, and sometimes the change between the two can happen quickly.

This helps explain why the same woman can experience seemingly contradictory symptoms at different times.

One month may bring breast tenderness, heavier bleeding, fluid retention or stronger PMS-type symptoms. Another may be dominated by hot flushes, vaginal dryness, disrupted sleep or feeling unusually flat.

The important point is that perimenopause is often a hormone fluctuation story before it becomes a consistently low-oestrogen story.

This is also why I am cautious about interpreting one isolated oestrogen result as though it represents what your hormones are doing all month.

The question is not simply, “Is my oestrogen high or low?”

It’s, “What is the wider hormonal pattern, and does it fit with what is happening in my cycle and symptoms?”

Why PMS and mood symptoms can intensify

For some women, one of the clearest signs of perimenopause is that the emotional part of the cycle becomes harder.

PMS that was once manageable may become more intense, anxiety may appear in the days before a period, or irritability and low mood may begin lasting longer than they used to.

This does not necessarily mean your hormone levels are simply “abnormal”.

Some women are particularly sensitive to the normal rise and fall of reproductive hormones and the neuroactive compounds they produce. In PMDD, for example, research suggests the problem is less about having unusually high or low hormone levels and more about how the brain responds to hormonal change, including changes in the progesterone-derived neurosteroid allopregnanolone.

As hormonal patterns become more variable during perimenopause, that sensitivity can become more noticeable. Women with an existing history of PMS or PMDD may find symptoms worsen, while some women experience significant premenstrual mood symptoms for the first time during the menopausal transition.

This is why I pay attention to when anxiety, irritability or low mood appears rather than treating mood as completely separate from the menstrual cycle.

A symptom that consistently worsens before a period tells us something different from anxiety or depression that is present at the same intensity throughout the entire month.

Migraines and nervous system sensitivity

For some women, perimenopause is also when headaches or migraines begin to change.

You may notice migraines becoming more frequent, appearing at different points in your cycle or becoming harder to predict than they once were. This is particularly common in women who have previously experienced hormonally triggered or menstrual migraines.

One reason is that migraine can be sensitive to changing oestrogen levels. During perimenopause, oestrogen can rise and fall more unpredictably, and rapid falls in oestrogen appear to be an important trigger for some women.

Histamine may also be relevant for some women, particularly when headaches occur alongside symptoms such as flushing, nasal congestion, itching or increased sensitivity to alcohol or certain foods. But I would be careful about assuming every perimenopausal migraine is a histamine problem.

This is where the wider pattern becomes useful.

A migraine that consistently appears around a hormonal shift may need to be approached differently from headaches being driven by poor sleep, iron deficiency, medication, neck tension or another underlying factor.

The symptom may be the same, but what is driving it can be very different.

Why sleep can suddenly become more fragile

Sleep can be one of the first things to change in perimenopause, and it doesn’t always look like difficulty falling asleep.

You may fall asleep easily but start waking at 2am or 3am, wake several times during the night, or find that once you’re awake your brain switches on and it becomes difficult to settle again.

Hormonal changes can contribute to this. Fluctuating oestrogen, changing progesterone, hot flushes and night sweats can all make sleep less stable.

But there is another layer that I think is important.

For many women, perimenopause arrives during one of the most demanding periods of their lives. You may be managing children or teenagers, work and financial pressures, ageing parents, relationship demands and the endless mental load of keeping everything running – often at exactly the same time your hormonal environment is becoming less predictable.

Your hormones are changing, but your life isn’t necessarily becoming any less demanding.

And when the nervous system is already carrying a high level of stress, sleep can become even more vulnerable. When the stress-response system is already under pressure, it can also become harder to settle back to sleep once you wake, particularly if you find yourself suddenly alert, anxious or “tired but wired” in the middle of the night.

This is why I don’t automatically assume every 3am waking is simply “low progesterone” or “low oestrogen”.

I want to know what else is happening around it: whether you’re waking hot, anxious or with your mind racing, what your stress levels are like, how well you’re recovering during the day and whether your sleep changed alongside other perimenopausal symptoms.

Sometimes perimenopause creates the vulnerability, while everything else you’re carrying determines how loudly that vulnerability shows up.

Perimenopause, anxiety and mental health

For some women, the emotional changes of perimenopause can be just as significant as the physical ones.

You may notice anxiety that seems to come from nowhere, irritability, tearfulness, a much lower tolerance for stress, loss of confidence, difficulty concentrating or simply a persistent feeling that you don’t quite feel like yourself anymore.

For some women, these changes can become much more severe, including significant depression, hopelessness or loss of enjoyment in things they previously loved.

This isn’t simply a failure to cope with midlife.

Changing oestrogen and progesterone can influence brain systems involved in mood, sleep and emotional regulation. At the same time, disrupted sleep, hot flushes, fatigue and the pressures many women are carrying during this stage of life can make those symptoms harder to manage.

Research is also beginning to highlight how significant the mental-health impact of the menopausal transition can be. A 2025 qualitative study of 42 women who experienced mental-health difficulties including suicidal thoughts or behaviours during perimenopause or menopause identified recurring experiences of hopelessness, exhaustion, worthlessness and feeling trapped. Many also felt the possible contribution of the hormonal transition had not been adequately recognised when they sought help.

This doesn’t mean every episode of anxiety or depression during perimenopause is caused by hormones, or that hormone therapy is always the answer.

Depression and anxiety deserve appropriate assessment and treatment in their own right. But when significant mood changes begin alongside changing cycles, hot flushes, night sweats, sleep disruption or other new perimenopausal symptoms, the hormonal transition deserves to be part of the clinical conversation too. Current menopause guidance also recognises depressive symptoms as part of the menopausal transition and recommends considering both the hormonal picture and standard mental-health care where appropriate.

The question isn’t simply whether a symptom is “hormonal” or “psychological”.

It is understanding why it has changed now, what else is happening alongside it and what kind of support is actually needed.

Perimenopause and your menstrual cycle

One of the clearest places perimenopause can show itself is in the menstrual cycle.

But the change is not always simply that periods become further apart.

Early in the transition, cycles can actually become shorter. Your period may begin arriving every 23 or 24 days when you were previously closer to 28 or 30. Later, cycles may become longer, more variable or occasionally disappear for a month or two as ovulation becomes less consistent.

Shorter, longer and skipped cycles

The important clue is often the change from your usual pattern.

A cycle that has been remarkably predictable for years may suddenly start shifting by a week or more. You might have several short cycles in a row, followed by a much longer one, or occasionally skip a period altogether.

As ovulation becomes less consistent, some cycles may also be anovulatory, meaning no egg is released. You can still bleed during an anovulatory cycle, so having a period does not always mean ovulation occurred normally that month.

This changing ovulatory pattern is one of the reasons cycle length can become more unpredictable during perimenopause.

So even if your periods are still coming every month, a clear change in cycle length can still be an early sign of perimenopause.

You don’t have to be skipping periods for the hormonal transition to have started.

Heavy periods and changing flow

Perimenopause doesn’t always mean periods become lighter as they gradually disappear.

For some women, the opposite happens.

Periods may become noticeably heavier, last longer than they used to or arrive closer together. You may also notice more clotting or a sudden change in what has always been a fairly predictable flow.

When ovulation becomes less consistent, progesterone production can also become more variable, which can affect the way the uterine lining builds and sheds.

But this is an area where I don’t like to assume everything is “just perimenopause”.

Heavy or changing bleeding can also occur with fibroids, adenomyosis, polyps, thyroid dysfunction and other causes of abnormal uterine bleeding. Over time, significant blood loss can also contribute to iron deficiency and anaemia, adding symptoms such as fatigue, breathlessness, headaches or feeling generally depleted.

So if your periods suddenly become much heavier, longer or different from your usual pattern, perimenopause may be part of the story – but it still deserves proper investigation.

Perimenopause can change the way you bleed, but it shouldn’t become a reason to stop asking why the bleeding has changed.

Perimenopause, weight and metabolic changes

Weight changes during perimenopause can be frustrating, particularly when your diet and exercise haven’t changed very much. And having to buy bigger pants is a pain in the butt!

But this is rarely a case as simple as “my metabolism has slowed down”.

As oestrogen levels become lower overall through the menopausal transition, changes in body composition can become more noticeable. Lower oestrogen is associated with changes in skeletal muscle mass and function, a greater tendency towards abdominal fat accumulation and reduced insulin sensitivity in some women.

But hormones are only one part of the picture. Ageing, activity levels, sleep, stress, nutrition and muscle mass all influence how the body handles glucose and stores fat.

Sleep and stress can add another layer. If you’re sleeping poorly, constantly rushing, juggling kids, working too hard, skipping meals or relying on caffeine to get through the day, appetite regulation, food choices and blood-sugar stability can become harder to manage. For many women, this is happening at exactly the same time their hormonal environment is becoming more vulnerable to changes in body composition and metabolic health.

This is why I don’t assume that weight gain in perimenopause means you simply need to eat less and exercise more. I want to know whether there have been changes in muscle mass, sleep, appetite, insulin sensitivity, thyroid function, alcohol intake, activity levels and the way you’re eating across the day.

The number on the scales may be the thing you notice, but it doesn’t always tell us what has actually changed underneath it.

Thyroid, iron and other factors that can make perimenopause feel worse

Perimenopause can explain a lot, but it shouldn’t become an explanation for everything.

Some women enter this transition already exhausted, sleeping poorly or struggling to cope with stress. When hormonal fluctuations are added on top, symptoms can feel much harder to manage.

Sometimes perimenopause isn’t creating the whole problem. It’s exposing what was already under strain.

Other health issues can add another layer. Heavier periods may gradually deplete iron stores, while thyroid dysfunction can overlap with symptoms such as fatigue, anxiety, weight changes, temperature sensitivity and poor concentration.

This is why I look at what was happening before your cycle changed, not just what appeared afterwards. The same symptom can have many different drivers. The important part is understanding which ones are relevant to you.

How do you know if you’re in perimenopause?

One of the confusing things about perimenopause is that many women are never really told how it is identified.

You may have had blood tests that were described as “normal” and been left wondering whether that means perimenopause has been ruled out. But medical guidelines recognise that, particularly after 45, perimenopause is usually identified from your age, symptoms and changes in your menstrual cycle rather than from one hormone result.

When reproductive hormone testing is clinically appropriate, follicle-stimulating hormone (FSH) and luteinising hormone (LH) – the brain hormones that signal the ovaries – can be interpreted alongside oestradiol.

If you are still cycling and these hormones are being assessed, they are commonly measured early in the cycle, around day 2-3, so they can be interpreted against a more consistent baseline.

As ovarian function changes, FSH often begins to rise because the brain is sending a stronger signal to stimulate the ovaries. LH may also rise as the transition progresses, while oestradiol can vary considerably from one cycle to another.

This is why one “normal” result doesn’t necessarily tell the whole story.

Where blood tests have been repeated over time, looking at the pattern across those results alongside what is happening clinically (changes in cycle length, ovulation, bleeding and symptoms) can provide much more context than interpreting one result on its own.

Perimenopause is rarely about finding one number that proves it. It’s about recognising the pattern of change.

Hormone therapy in perimenopause

Hormone therapy can be very helpful in perimenopause, but the hormones needed are not necessarily the same at every stage of the transition.

In earlier perimenopause, one of the first changes is often less consistent ovulation and therefore more variable progesterone production. For some women, micronised progesterone may be considered on its own at this stage, depending on the symptom pattern and individual clinical picture.

Oestrogen does not always need to be added straight away either.

Earlier in perimenopause, your own oestrogen may still be relatively high or fluctuating significantly. The need for oestrogen often becomes clearer later in the transition, particularly when hot flushes, night sweats, vaginal dryness or other more persistent low-oestrogen symptoms become prominent.

Testosterone has a more specific role. It may be considered for persistent, distressing low libido when other contributing factors have been addressed and menopausal hormone therapy (MHT), often still referred to as HRT, has not been enough. Current guidelines do not support testosterone as a general treatment for fatigue, weight gain or overall wellbeing.

And importantly, oestrogen and testosterone are not automatically suitable for every woman.

Personal and family history matter. A history of hormone-sensitive cancer, unexplained bleeding, clotting risk, cardiovascular disease or other relevant conditions may change whether hormone therapy is appropriate or whether specialist input is needed.

Testosterone can also be converted into oestradiol in the body, which is one reason individual medical history needs to be considered when deciding whether it is appropriate. Women with a history of hormone-sensitive cancer or other conditions where hormone exposure is clinically relevant may require specialist advice.

This is why I don’t think of perimenopausal hormone therapy as simply replacing whatever looks “low” on a blood test.

The better question is which hormone, if any, is appropriate for you at this stage – based on your symptoms, cycle pattern, medical history and individual risk factors.