Your Brain and Ovaries Are Having a Conversation All Month

Ever wonder why your body can seem completely different from one week to the next?

Maybe your sleep is suddenly terrible. Your mood is doing things you don't remember approving. Your period is still showing up pretty much when expected, so you're thinking, Well, apparently everything is fine.

Except... you don't feel fine.

Here's the part I wish more of us had been taught:

Your menstrual cycle isn't just something your ovaries do.

Your brain and ovaries are in constant communication throughout the cycle. And once you understand that conversation, a lot of the “Why is my body doing this?” stuff starts to make a lot more sense.

So who's actually running the show?

Short answer: they're working together.

Your brain sends signals that help coordinate the cycle. One of the important players is follicle-stimulating hormone, or FSH.

FSH helps recruit and develop a follicle in the ovary. As that follicle develops, it produces estradiol, the main form of estrogen during the reproductive years.

Then, when estradiol reaches the right level and stays elevated long enough, it contributes to the signal that triggers a surge in another hormone: luteinizing hormone, or LH.

That LH surge helps trigger ovulation.

After ovulation, the follicle that released the egg becomes the corpus luteum, which produces progesterone during the second half of the cycle.

So, very roughly:

And then the conversation keeps going.

The hormones produced by the ovaries feed information back to the brain, which adjusts its signaling as the cycle moves along. The menstrual cycle is a coordinated hormonal system, not simply “my period comes every month.”

Which brings us to perimenopause.

Because this is where things get interesting.

As you move through the menopause transition, ovarian function becomes less predictable. Hormone levels can fluctuate, ovulation can become less consistent, and the communication between the brain and ovaries changes.

And here's the bit that can really mess with your head:

Your period doesn't necessarily have to become wildly irregular before you notice other changes.

You might still be getting your period. You might even be getting it fairly predictably.

Meanwhile, you may be thinking:

Why am I waking up at 3 a.m.?

Why am I suddenly so irritable?

Why can I remember a random phone number from 1998 but not why I walked into this room?

Why does my stress tolerance seem to have disappeared?

Not every symptom you experience in your 40s is automatically perimenopause, of course. There are plenty of other things worth considering, which is exactly why symptoms deserve context rather than a giant “hormones!” sticker slapped on everything.

But changing reproductive hormones can be part of the picture.

The Endocrine Society notes that hormone levels fluctuate during the menopausal transition and that symptoms can include things such as hot flashes, mood changes, mental fogginess and sleep disruption.

And this is why “my hormones are crazy” isn't actually the best explanation.

They're not supposed to sit at one perfectly stable number.

Hormones fluctuate throughout the menstrual cycle. That's their job.

So if you've ever had a hormone test and thought, Great. I have a number. Now tell me what is happening to me, there's an important caveat.

One hormone measurement is only one moment in time.

Hormone levels can change depending on where you are in your cycle, and reproductive hormone testing can be difficult to interpret during perimenopause because levels can fluctuate considerably. The Endocrine Society specifically notes that FSH and estradiol measurements can be inconsistent during the transition.

That doesn't mean bloodwork is useless.

It means it needs to be interpreted in context.

Your symptoms. Your cycle history. Your medical history. Your age. Other possible causes.

The whole picture matters.

So what should you actually pay attention to?

You don't need to become a full-time hormone detective.

Please don't add another spreadsheet to your life. You already have enough tabs open.

But it can be useful to notice changes in your own baseline.

Start paying attention to things like:

• Has your cycle length changed?
• Has your bleeding pattern changed?
• Are your sleep patterns different?
• Are symptoms showing up at particular points in your cycle?
• Are mood or cognitive changes becoming more noticeable?
• Are several changes happening at the same time?

Your cycle can give you useful information about what is changing, particularly when you look at patterns over time rather than one weird Tuesday.

And if something feels different, that's worth talking about with your healthcare provider.

Not because every change means something is wrong.

Because common doesn't automatically mean irrelevant.

The bigger picture

This is the piece I find most useful:

Your period is the part of the cycle you can see.

But underneath it is an entire communication system involving your brain, pituitary hormones, ovaries, estrogen, progesterone and the tissues responding to those signals.

Once you understand that, perimenopause starts to look a little less like your body randomly throwing things at you and a little more like a system going through a transition.

And honestly?

I find that much more useful.

Because when you understand the system, you can start asking better questions.

And better questions are where better healthcare conversations begin.

Want to see your own pattern?

Take the free Rise Decoded Symptom Assessment.

63 symptoms · 9 categories · 4 minutes.

It won't diagnose you. It will help you see your own pattern and give you something concrete to take into a conversation with your doctor.

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If You Want More Than Tracking

If you've been reading all of this thinking, Okay, great. I understand the hormones a little better. But I actually want someone to help me figure out what's going on, that's a different question.

And it's one worth asking.

One service I've been looking at for Canadians is Science & Humans' Perimenopause & Menopause program.

What caught my attention is that it isn't positioned as simply “take this supplement and hope for the best.” The program starts with an online health assessment and, when appropriate, bloodwork covering 40+ biomarkers, including reproductive hormones, thyroid markers, metabolic measures and other health markers. A Canadian-licensed clinician then reviews your information with you virtually and, when clinically appropriate, develops an individualized treatment plan. The program also includes ongoing follow-up and access to health-coach support.

That doesn't mean everyone needs hormone therapy. They don't.

And it doesn't mean every symptom is caused by changing hormones.

What I like about the approach is the emphasis on looking at the bigger picture and having an actual clinical conversation about your symptoms, history and options.

If you're in Canada and you're looking for virtual perimenopause care, it's a service I'd put on your list to investigate.

Science & Humans is an affiliate partner of The Rise Decoded. If you choose to use my link, I may earn a commission. This recommendation is for informational purposes and isn't a substitute for individualized medical advice.

Explore the Science & Humans Perimenopause & Menopause Program → Science & Humans Perimenopause & Menopause Program