The Stages of Perimenopause: Symptoms, Hormone Changes & Naturopathic Treatment

If you're in your late 30s or 40s and suddenly your periods, sleep, mood, energy, or body seem to be changing, you may be wondering: Could this be perimenopause?

The answer may be yes—even if you're still having regular periods.

Perimenopause is not simply the few months before menopause. It is a multi-year transition during which ovarian function and hormone patterns become increasingly variable.

For some women, the first signs are changes in their menstrual cycle. For others, sleep disruption, anxiety, PMS, hot flashes, brain fog, migraines, or changes in libido appear first.

And importantly, there isn't one single treatment that works for every woman or every stage.

As a naturopathic doctor specializing in women's hormonal health, I find it much more useful to ask:

Where are you in the menopause transition, what symptoms are you experiencing, and what is driving those symptoms?

What exactly is perimenopause?

Menopause is defined retrospectively after 12 consecutive months without a menstrual period, assuming there isn't another explanation.

Perimenopause is the transition leading up to that point.

The STRAW+10 reproductive-aging framework divides the menopausal transition into an early and late stage, based primarily on changes in menstrual cycles. Early transition is characterized by increasing variability in cycle length, while late transition involves increasingly long gaps between periods—typically 60 days or more.

But there is an important clinical caveat:

Hormones don't change in a neat, predictable downward line.

Estradiol can fluctuate dramatically. Ovulation becomes less consistent. Progesterone production can become less reliable, particularly in cycles where ovulation doesn't occur. FSH also becomes increasingly variable.

This hormonal variability is a major reason perimenopause can feel so unpredictable.

Stage 1: Late Reproductive Years

"Something feels different, but my periods are still pretty normal."

This stage technically precedes the menopausal transition, but I like to call it pre-perimenopause, and often women need support at this point.

Your periods may still arrive regularly, but subtle changes in ovarian function may already be occurring. Some women begin noticing:

• Shorter menstrual cycles

• More pronounced PMS

• New anxiety or irritability before their period

• Changes in sleep

• Heavier periods

• Breast tenderness

• New migraines

• Changes in libido

• More difficulty recovering from stress

• Subtle changes in body composition

• Less predictable energy throughout the cycle

  
  

This is often the stage where women tell me:

"I don't feel like myself anymore, but I don't think I'm old enough for perimenopause."

You may not technically be there yet—but that doesn't mean these symptoms should be ignored.

How I approach this stage

This is often an excellent time to focus on foundational health rather than trying to "balance hormones."

My priorities include:

1. Protein and adequate nutrition

Muscle mass becomes increasingly important as we move through midlife. Adequate protein, resistance training, and overall nutritional adequacy are foundational for metabolic and musculoskeletal health.

2. Blood sugar regulation

Large swings in blood glucose can contribute to energy crashes, cravings, irritability, and sleep disruption. Regular meals containing protein, fibre, healthy fats, and minimally processed carbohydrates can be helpful.

3. Strength training

If you're not already doing resistance training, this is one of the most valuable habits to establish before and during the menopause transition.

4. Sleep

Don't wait until sleep becomes severely disrupted to address it. Circadian rhythm, morning light exposure, exercise, caffeine, alcohol, stress, and sleep environment all matter.

5. Understand your cycle

Tracking your menstrual cycle and symptoms can reveal patterns that are otherwise easy to miss.

Stage 2: Early Perimenopause

"My periods are still coming, but they're changing."

This is what many people think of as the beginning of perimenopause.

One of the defining clinical signs is increasing variability in menstrual-cycle length. The STRAW+10 framework describes persistent differences of approximately 7 days or more between consecutive cycles.

You might notice:

• Periods coming earlier than they used to

• Occasionally longer cycles

• Heavier or lighter bleeding

• More intense PMS

• New breast tenderness

• Increased anxiety or irritability

• Sleep changes

• Brain fog

• Headaches or migraines

• Changes in libido

• Hot flashes or night sweats

• Increased sensitivity to stress

What's happening hormonally?

This is where things get particularly interesting.

The ovaries aren't simply producing less estrogen.

Instead, hormone production becomes more erratic.

Ovulation may still occur regularly in many cycles, but ovarian signaling becomes less predictable. FSH can fluctuate, estrogen can swing considerably from cycle to cycle, and progesterone production may become less consistent as ovulation becomes less reliable.

This is why you can have a month where you feel completely normal followed by a month where PMS, insomnia, anxiety, or heavy bleeding suddenly become much worse.

How I approach early perimenopause

The goal isn't necessarily to suppress every hormonal fluctuation.

Instead, we want to understand which symptoms are occurring, when they're occurring, and what systems may be contributing.

For example:

If PMS, irritability, anxiety, or poor sleep occur primarily after ovulation:I may look more closely at ovulation, luteal-phase hormone patterns, sleep, stress physiology, nutrition, and progesterone sensitivity.

If periods are becoming heavier:I want to assess iron status, particularly ferritin, and consider structural causes of heavy bleeding when appropriate.

If fatigue or brain fog is prominent:Thyroid function, iron status, B12/folate, vitamin D, sleep quality, metabolic health, medications, mood, and other contributors may need to be considered rather than automatically attributing everything to hormones.

If hot flashes or night sweats appear:These are vasomotor symptoms and can be treated effectively. Hormone therapy is an effective treatment when appropriate, but evidence-based non-hormonal options also exist.

Stage 3: Late Perimenopause

"My cycles are becoming unpredictable."

In late perimenopause, the gaps between periods become longer.

A key STRAW+10 marker is a period of 60 days or more without menstruation. Hormonal fluctuations become increasingly pronounced, and anovulatory cycles become more common.

This is often the stage when symptoms become more noticeable.

Women may experience:

• Hot flashes

• Night sweats

• Significant sleep disruption

• Anxiety or mood changes

• Brain fog

• Fatigue

• Changes in libido

• Vaginal dryness

• Joint or muscle symptoms

• More irregular or heavy bleeding

• Migraines

• Changes in body composition

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And symptoms don't necessarily follow the menstrual cycle anymore because the cycles themselves are becoming less predictable.

How I approach this stage

This is the point where I often shift from primarily supporting the body's own hormonal rhythms toward more direct symptom management.

Depending on the individual, that can include:

Hormone therapy

For appropriate patients, menopausal hormone therapy can be highly effective for vasomotor symptoms and genitourinary symptoms. The decision is individualized based on symptoms, age, medical history, cardiovascular and breast health, bleeding patterns, uterus status, personal preferences, and other risk factors.

For women with a uterus, systemic estrogen therapy generally needs to be accompanied by appropriate progestogen protection of the endometrium.

Importantly, hormone therapy isn't appropriate for everyone, and the decision should be individualized.

Non-hormonal treatment

There are also evidence-based non-hormonal approaches for hot flashes, sleep, and mood symptoms. Menopause-specific cognitive behavioural therapy is one option recommended in current guidance, either alongside hormone therapy or when hormone therapy isn't appropriate or isn't desired.

Nutritional and lifestyle support

At this stage, the basics become even more important:

• Adequate protein

• Resistance training

• Weight-bearing exercise

• Cardiovascular activity

• Fibre-rich foods

• Adequate calcium and vitamin D

• Alcohol moderation

• Sleep support

• Stress management

• Maintaining metabolic health

These aren't simply "lifestyle recommendations." They are strategies for supporting muscle, bone, cardiovascular and metabolic health during a major hormonal transition.

Stage 4: Menopause

"I haven't had a period for 12 months."

Menopause isn't a phase that lasts for years.

It is actually one point in time: the final menstrual period, which can only be identified retrospectively after 12 months without a period.

Many people say they're "in menopause" when they are actually in perimenopause.

Once menopause has occurred, ovarian estrogen production has decreased substantially and hormone levels generally become less variable than during the transition.

But symptoms don't necessarily disappear immediately.

Hot flashes, sleep changes, vaginal or urinary symptoms, changes in sexual function, and other symptoms can continue after the final period.

The focus now changes

Rather than trying to manage fluctuating hormones, the focus increasingly becomes:

How do we support health in a lower-estrogen environment?

That includes:

• Bone health

• Muscle mass and strength

• Cardiovascular health

• Metabolic health

• Brain health

• Sexual and genitourinary health

• Sleep

• Mental health

• Maintaining quality of life

Current menopause guidance also emphasizes maintaining muscle mass and strength and paying attention to bone health throughout the menopause transition.

What Does a Naturopathic Doctor Do for Perimenopause?

This is where a personalized approach can be particularly helpful.

Rather than assuming that every symptom is caused by "low estrogen" or "estrogen dominance," I want to understand the whole clinical picture.

For example, a woman with fatigue, heavy periods, anxiety, and insomnia might have several overlapping contributors:

Hormonal:Changing ovulation and estrogen/progesterone patterns

Nutritional:Iron deficiency, inadequate protein, or other nutrient insufficiencies

Metabolic:Insulin resistance or blood sugar dysregulation

Thyroid:Thyroid dysfunction

Sleep:Insomnia, sleep apnea, circadian disruption, or vasomotor symptoms

Stress:Chronic psychological or physiological stress

Gynecological:Fibroids, adenomyosis, endometriosis, or other causes of abnormal bleeding

Treating only one piece of the puzzle may leave the woman feeling like something is still missing.

A naturopathic assessment may therefore include a detailed history of your menstrual cycle and symptoms, review of nutrition and lifestyle, appropriate laboratory testing, assessment of thyroid and metabolic health, evaluation of nutrient status, and consideration of hormonal and conventional medical treatment options when appropriate.

The goal is to put the pieces together.

When Should You See a Naturopathic Doctor for Perimenopause?

You don't need to wait until your periods become extremely irregular.

It can be helpful to seek support if you're noticing new or worsening:

• PMS or PMDD-like symptoms

• Anxiety or mood changes

• Sleep problems

• Hot flashes or night sweats

• Brain fog

• Fatigue

• Heavy or irregular periods

• Migraines

• Changes in libido

• Vaginal or urinary symptoms

• Changes in body composition

• Difficulty maintaining muscle

• New metabolic concerns

  
  

You Don't Have to "Just Push Through" Perimenopause

There is a persistent idea that women simply have to accept feeling terrible in their 40s.

I don't agree.

Some degree of hormonal change is inevitable. Suffering doesn't have to be.

There are evidence-based hormonal and non-hormonal treatments for many of the symptoms associated with perimenopause, alongside nutrition, exercise, sleep, stress management, and targeted naturopathic care.

The most important thing is to understand where you are in the transition and what your body is actually asking for.

Perimenopause isn't one hormone going down.

It's a dynamic transition—and your treatment plan should be dynamic, too.

If you're experiencing new changes in your periods, sleep, mood, energy, body composition, libido, or temperature regulation, it may be worth looking beyond "normal aging" and having a thorough assessment.

Looking for perimenopause support in Calgary?

I work with women in Calgary who are navigating perimenopause, menopause, and the hormonal changes that come with midlife. A personalized naturopathic assessment can help identify the factors contributing to your symptoms and create a treatment plan that fits your health history, goals, and stage of the menopause transition.