Why do I feel like I'm losing my mind in perimenopause?

Why do I feel like I'm losing my mind in perimenopause?

There's a particular kind of unsettled fear that arrives when your own mind starts to feel unreliable. It's not always dramatic, or sudden. It can feel a bit slippery, a bit difficult to put your finder on what's wrong. It is like a slow accumulation of moments where you reach for something that should be there and it isn't.

A word. A thought. The name of a colleague you've worked with for five years (jeez, this can be embarrassing).

You cover it, carry on, and later lie awake wondering what exactly is happening to you.

If you're in your 40s or early 50s and this sounds familiar, you're not imagining it. You're not losing your mind. And you're very far from alone.

What perimenopause brain fog actually feels like

The experiences vary, but there are patterns that show up with striking consistency:

• Words disappear mid-sentence, often when you most need them.
  • You might find yourself gesturing at the thing you can't name, hoping context will carry you through.
  • You describe the PowerPoint presentation as "the slides thing."
  • You call the door "the wall opening."
  • You say things like “you know – the actor, he’s Canadian, with the hair… he acted in that movie… in the 90s” (and weirdly, if you’re with your girlfriends, someone DOES know exactly who you’re talking about – and you all laugh uproariously).
• You lose your train of thought in meetings
• You reread something multiple times and nothing sticks
• You walk into a room and forget why you’re there

Alongside this, there are emotional shifts:

• Feelings arrive faster and with more intensity (interestingly, research suggests anger is not the dominant emotion of perimenopause, in fact, women's capacity to manage and express anger tends to improve with age from midlife onwards)
• Patience wears thinner than it used to
• You feel more reactive, or unexpectedly tearful at innocuous things
• Recovery takes longer

And underneath it all, often a quieter experience, a vague sense of disconnection from the version of yourself that used to feel capable and grounded. An unsettling feeling that you're performing competence rather than inhabiting it.

These experiences don't always arrive together, and they don't always arrive consistently. Some days feel entirely normal. Others feel nothing like it.

What’s actually happening in the perimenopausal brain

The short answer is that your brain is undergoing a significant transition. It’s not a breakdown, but a reconfiguration.

Oestrogen has receptors throughout the brain, including areas involved in:

• Memory
• Attention
• Emotional regulation.

During perimenopause, oestrogen levels don't simply decline, they fluctuate, sometimes dramatically, before eventually settling at a lower level. The brain, which has been operating in a particular hormonal environment for decades, is now adapting to a new one.

Neuroscientific research (including work by Lisa Mosconi whose work focuses specifically on the female brain) describes this process as a kind of neural renovation. It’s a period of significant restructuring that is ultimately adaptive, but temporarily disruptive. Brain imaging studies show measurable changes in how the perimenopausal brain uses glucose, particularly in regions associated with memory and cognition.

This is why:

• Symptoms fluctuate
• Stress and poor sleep make them worse
• They often improve over time (for most women, they ease as hormonal levels stabilise)

It also explains why they can feel so alarming. The brain noticing changes in itself is, by nature, unsettling.

What this does not mean about you

It does not mean:

• You are in cognitive decline
• You are becoming less capable
• You’ve ‘lost your edge’

What’s changing is ease of access, not ability.

Research shows that the perimenopausal brain is engaged in significant adaptive work. Research on midlife more broadly shows increases in:

• emotional intelligence
• perspective
• judgement and decision-making capacity.

These are measurable capacities that research suggests continue developing well into later midlife.

The story that so many women land on, something is wrong with me,  is understandable.

But it isn't accurate.

It's what happens when a biological process goes unnamed. When there's no language for what's happening, we default to the harshest available explanation.

You're not losing your edge. Your brain is working hard in conditions it hasn't encountered before. Those are very different things.

What helps when you understand what’s happening

Knowing what's happening doesn't make the word loss less frustrating in the moment, or the emotional volatility less exhausting. But it does change what those experiences mean, and what you do with them.

The women who navigate this transition most effectively aren't the ones who push harder, perform better, or find ways to conceal what's happening. They're the ones who tend to:

• stop interpreting it as personal failure
• understand what's actually going on
• adjust their expectations of themselves accordingly
• build the kind of support around them that this particular season calls for
• work with their brain, not against it

This isn't about managing decline.

It's about moving through a transition with as much clarity, self-knowledge, self-trust and self-compassion as possible.

Common questions about perimenopause and brain fog

Is brain fog in perimenopause normal?
Yes. It’s one of the most commonly reported symptoms and is linked to hormonal changes in the brain.

Is this early dementia?
For the vast majority of women, no. Perimenopausal cognitive changes are temporary and fluctuate, unlike neurodegenerative conditions. If you’re noticing that your day to day functioning is impaired please speak to a medical professional.

Will it go away?
For most women, symptoms improve as hormones stabilise post-menopause.

Why is it worse at work or under pressure?
Stress (via cortisol) affects many of the same cognitive processes that oestrogen supports which may amplify the experience.

Where this leaves you

You’re not losing your mind.

You’re in the middle of something.

And the middle, however uncomfortable, is not the end of the story.

If this experience feels familiar, this is exactly the kind of transition we unpack inside The Midlife Reframe, in a way that’s grounded, practical, and actually usable in day-to-day life.