You’re tired. Your sleep suddenly isn’t what it used to be. Your weight is changing even though you haven’t dramatically changed how you eat. You walk into a room and forget why you’re there. Your period is heavier. Or earlier. Or later. Or somehow all three depending on the month.

Maybe you’re more anxious, irritable or emotional than usual. And somewhere along the way, you start wondering:

What is happening to me?

For many women in their late 30s, 40s and early 50s, the answer may be perimenopause. But there’s something important I want you to understand. Perimenopause can explain a lot. It shouldn’t automatically explain everything. Fatigue can be influenced by hormones, but also iron deficiency, thyroid concerns, poor sleep or other factors.

Weight changes may happen alongside hormonal changes, but blood sugar, muscle mass, sleep and activity matter too. Brain fog may be related to changing estrogen levels, but poor sleep, iron, B12, thyroid function and metabolic health may also contribute. That distinction matters. Because the goal isn’t simply to say, “It’s your hormones.”

The goal is to understand your version of perimenopause.

What is perimenopause?

Perimenopause is the transition leading up to menopause. Menopause itself is reached after you have gone 12 consecutive months without a menstrual period. Perimenopause usually begins in the 40s, although changes can begin earlier. And it isn’t necessarily a short transition. One of the biggest changes happening behind the scenes is that ovulation becomes less predictable.

Some months you may ovulate normally. Other months you may not. As this happens, estrogen and progesterone no longer follow the predictable rhythm they once did. Instead, hormone levels can fluctuate considerably from one cycle to another. That unpredictability is one reason symptoms can feel so confusing. You may feel fine for several weeks.

Then suddenly:

  • your sleep falls apart

  • your period comes early

  • your breasts feel tender

  • you’re more anxious

  • you wake up sweating

  • your appetite changes

  • your energy crashes

And the next month may look completely different. Perimenopause often isn’t a smooth decline in hormones. It’s a fluctuating transition. That’s why one snapshot of how you feel, or sometimes even one hormone test, doesn’t always tell the whole story.

Common perimenopause symptoms

Symptoms can change from month to month. The sections below explain how changes in your cycle, sleep, energy, weight and mood can fit together.

Period changes and heavier bleeding

Before dramatic hot flashes ever appear, your menstrual cycle may begin changing. You may notice:

  • cycles becoming shorter or longer

  • periods becoming heavier or lighter

  • more spotting

  • heavier bleeding or clotting

  • PMS changing

  • skipped periods

  • symptoms becoming worse at certain points in your cycle

Tracking your cycle and symptoms can be surprisingly helpful. Instead of simply writing “tired” or “bad PMS,” look for patterns. When are you most tired? When does your sleep change? Are night sweats worse just before your period? Does anxiety spike at a predictable time? Is your bleeding becoming progressively heavier?

Patterns give us information. And information helps us make better decisions.

Hot flashes, night sweats and sleep changes

Hot flashes are one of the symptoms most strongly associated with menopause, but they can begin during perimenopause while you’re still getting regular periods. Changing estrogen levels affect the brain’s temperature-regulating centre. Suddenly, your body becomes much more sensitive to small changes in temperature. Cue the hot flash.

Or the 3 a.m. wake-up drenched in sweat. Night sweats can also create a second problem:

They destroy your sleep.

And once sleep deteriorates, other symptoms can become louder. Fatigue. Brain fog. Irritability. Cravings. Lower resilience to stress. Difficulty exercising. This is one reason I rarely look at perimenopause symptoms as isolated problems. Your hot flashes may be affecting your sleep. Your sleep may be affecting your energy.

Your energy may be affecting exercise. Poor sleep and reduced activity may then affect weight and blood sugar. Everything is connected.

Weight gain and changes around your middle

This is one of the biggest frustrations I hear from women. “I haven’t changed anything. Why is my body changing?” During perimenopause, fat distribution tends to shift. Instead of weight being distributed primarily around the hips and thighs, more fat may accumulate around the abdomen. At the same time, ageing is associated with declining muscle mass and a lower metabolic requirement.

Daily movement can also quietly decline. Not necessarily because you suddenly became inactive. You may simply be more tired. Sleeping poorly. Experiencing joint discomfort. Moving slightly less throughout your day. And hormonal fluctuations may affect appetite and cravings as well. So I don’t think the answer is automatically:

eat less and exercise more.

Often we need a more complete picture. What is happening with your blood sugar? How much protein are you eating? Are you maintaining muscle? How are you sleeping? Are you exhausted and trying to compensate with caffeine and quick carbohydrates? Are there thyroid concerns? Is your activity realistic for your current energy level?

These questions matter far more than blaming yourself for somehow losing discipline.

Related reading: Insulin resistance and prediabetes in women.

If you also have a history of irregular cycles, acne, excess facial hair or insulin resistance, there may be overlap with PCOS that deserves consideration rather than assuming everything is caused by age alone.

Explore my approach to PCOS care.

Fatigue, low iron and thyroid symptoms

Yes, perimenopause can make you tired. Changing estrogen and progesterone may affect sleep quality, and night sweats can repeatedly interrupt restorative sleep. But fatigue is also an excellent example of why I don’t like stopping at “hormones.” Other areas worth considering include:

  • thyroid function

  • iron and ferritin

  • vitamin B12

  • vitamin D

  • blood sugar

  • inflammation

  • sleep apnea

  • heavy menstrual bleeding

Heavy periods deserve particular attention. If you’re losing more blood every month, iron stores can gradually fall. And iron deficiency can contribute to fatigue, reduced exercise tolerance, restless legs and difficulty concentrating. So if you’re exhausted and your periods have become dramatically heavier, that is a connection worth investigating.

Read more about fatigue in women and the factors worth investigating.

Thyroid symptoms can overlap with perimenopause as well. Fatigue. Weight change. Brain fog. Mood changes. Hair changes. Changes in menstrual bleeding. That doesn’t mean these symptoms are necessarily caused by your thyroid. But it does mean thyroid function deserves consideration when the clinical picture fits.

Learn about hypothyroidism symptoms and what to do about them.

For more background, read my introductory guide to Hashimoto’s disease.

Brain fog and difficulty concentrating

One of the most unsettling perimenopause symptoms is cognitive change. You forget words. Lose your train of thought. Walk into a room and forget what you needed. Struggle to concentrate on work that used to feel easy. This is commonly described as brain fog. Hormonal fluctuations can affect cognition during the menopause transition, but once again, hormones aren’t the only consideration.

Sleep matters enormously. So do thyroid function, iron, B12, folate, vitamin D, blood sugar, cardiovascular health and overall nutrition. That’s actually reassuring. Because instead of assuming your brain is simply “getting old,” there may be several areas we can look at and support. Movement matters too. Regular physical activity supports not only body composition and cardiovascular health but cognitive health as well.

Your brain doesn’t exist separately from the rest of your body.

Anxiety, irritability and mood changes

A woman may tell me:

“I’ve never been an anxious person before.” Or:

“I feel like I have no tolerance anymore.” Perimenopause can be a sensitive time for mood. Changing estrogen and progesterone can interact with systems involved in mood regulation. Women with a previous history of depression, anxiety, postpartum depression, severe PMS or PMDD may be particularly vulnerable to mood changes during this transition.

But we still want to look at the whole picture. Poor sleep can worsen mood. Iron, vitamin D or B12 deficiency may contribute to how you feel. Thyroid dysfunction can sometimes mimic or aggravate symptoms of anxiety or depression. And then there is life itself. Many women are entering perimenopause while simultaneously managing children, teenagers, ageing parents, demanding careers, relationships and years of accumulated stress.

Hormones matter. But context matters too. If anxiety or depression becomes severe, debilitating, or includes suicidal thoughts, immediate medical and mental health support is important.

Vaginal dryness and urinary symptoms

This is one of the least discussed parts of menopause care. As estrogen levels decline, tissues in the vagina, vulva, bladder and urinary tract can change. Symptoms can include:

  • vaginal dryness

  • burning or irritation

  • pain with sex

  • urinary urgency

  • discomfort with urination

  • recurrent urinary tract infections

Unlike some perimenopause symptoms that may settle over time, these symptoms can progress if they aren’t addressed. And there are treatment options. Depending on the situation, they may include vaginal moisturizers, lubricants, pelvic floor support and prescription options such as low-dose vaginal estrogen. You don’t need to quietly accept painful sex, chronic dryness or recurrent urinary discomfort as simply part of getting older.

Bring it up.

Perimenopause treatment options

Hormone therapy can be an effective treatment for certain menopause symptoms, particularly hot flashes and night sweats. And importantly, you do not necessarily need to wait until your periods have completely stopped before discussing hormone therapy. Perimenopause is part of the menopause transition. Treatment decisions should be individualized based on your symptoms, health history, personal preferences, potential benefits and potential risks.

Hormone therapy also isn’t the only option. Depending on the symptom and your medical history, lifestyle strategies, nutrition, non-hormonal prescription medications and selected supplements may all play a role. The point isn’t that every woman needs hormones. Or that every woman needs supplements. The point is that you deserve to understand your options.

Testing for perimenopause and related symptoms

There is no single “perimenopause blood test” that explains everything. Hormones can fluctuate significantly during this stage. Instead, testing is often most useful when it helps us understand the other factors that may be contributing to your symptoms. Depending on the woman, the picture may include areas such as:

  • CBC and iron status

  • thyroid testing

  • vitamin B12

  • vitamin D

  • blood sugar

  • cholesterol

  • inflammation markers

  • blood pressure

  • sleep apnea assessment

  • appropriate cervical, breast and bone-health screening

Hormone testing may sometimes add useful information, but symptoms, menstrual history and the broader health picture remain important. This is where I think good perimenopause care becomes much more interesting than simply checking estrogen.

My approach to perimenopause care

This is the part that matters most to how I work. I don’t assume every symptom is caused by perimenopause. And I also don’t dismiss symptoms because your standard blood work came back “normal.” I want to understand the pattern. Your periods. Your sleep. Your energy. Your weight history.

Your stress. Your digestion. Your medications. Your thyroid history. Your relationship with food and exercise. Your blood work. What changed. And when it changed. Then we start connecting the dots. Sometimes hormones are clearly playing a large role. Sometimes we discover that heavy periods and low iron are contributing to exhaustion.

Sometimes thyroid function deserves closer attention. Sometimes blood sugar and metabolic changes are part of why weight suddenly feels harder to manage. Sometimes a woman is sleeping six hours a night, waking repeatedly and trying to solve daytime fatigue with another supplement. Usually, there isn’t one magical answer.

My approach is to decode the bigger picture first, then build a realistic plan around what we find. That may include nutrition, sleep, stress support, movement, evidence-informed supplements and discussion of medical treatment options when appropriate. And I believe in looking at both conventional laboratory ranges and the clinical context around those results.

A lab value is useful. Your story is useful. The combination is far more useful.

Where to start with perimenopause symptoms

A helpful place to begin is simple:

Small, sustainable changes matter. You don’t need to overhaul your diet, start training six days a week, take twelve supplements and completely reinvent your life by Monday. Start where the biggest signal is. If you’re exhausted, start there. If your periods are extremely heavy, investigate that. If sleep has collapsed, work on sleep.

If weight has changed dramatically, look at metabolic health, nutrition and muscle rather than immediately cutting more calories. If your brain feels foggy, ask what might be contributing. Perimenopause isn’t something you need to fight. But it is a time when your body may start asking for a different kind of support.

And sometimes the symptoms that feel random aren’t random at all. They’re information. The goal is to understand what that information is telling us.

Book a perimenopause consultation in Ontario

If you’re in Ontario and experiencing fatigue, stubborn weight changes, brain fog, sleep changes, heavier periods, thyroid concerns or other symptoms that may be connected with perimenopause, you can book an initial naturopathic consultation with me. We’ll review your health history, symptoms and available blood work, identify areas that may deserve further investigation, and build a plan based on your health rather than a generic menopause checklist.

Book an initial consultation

This article is for educational purposes only and does not replace individualized medical advice, diagnosis or treatment. Speak with an appropriate healthcare professional about new, severe or persistent symptoms and before starting supplements or hormone therapy.