“I feel like I’m losing my mind. I can’t finish a sentence. I walk into a room and have no idea why I’m there. I actually forgot my own phone number last week. This sounds dramatic, but it’s real.”
These are some of the things I’ve heard women say recently. Laughing a little when she says it — you know the laugh. The one we do when we’re describing something that actually terrifies us.
One woman specifically, 43 — exercised regularly, ate well, got to bed at a reasonable hour, and had even started meditating. By every metric she knew about, she was doing everything right. And yet her brain felt like it was wrapped in wet cotton.
Sound familiar?
She’d Googled her symptoms, of course. Hormones came up. Perimenopause came up. Thyroid came up. She’d had her levels checked — everything was “normal.” And so she’d been quietly carrying this thing alone, wondering if she was just stressed, or getting older, or maybe a little bit of both. And totally, utterly, confused.
So here’s what I told her.
You’re not losing your mind. Your hormones are absolutely part of this story, but they’re not the whole story. There’s something else happening — something that most conventional conversations about brain fog completely miss — and it lives in your nervous system.
First, let’s talk about what brain fog actually is
Brain fog’s one of those terms that’s become so commonplace it can feel like we’re not taking it seriously anymore — like calling a broken leg a “leg boo-boo.” But the experience it describes is genuinely disorienting.
Brain fog might look like difficulty focusing, experiencing forgetfulness, or thoughts that are slower or unclear. It’s not just forgetting where you put your keys. It’s forgetting that you own keys.
It’s sitting in front of an email you’ve read three times and still not being able to figure out what the heck you’re trying to say. It feels like the version of you that used to be sharp and clear has temporarily left the building.
An estimated 44–62% of women experience subjective cognitive decline in perimenopause — and those are just the women in the perimenopausal window.
The reality is that women across a much wider age range report these symptoms, often years before any formal hormonal transition begins. Which means if we limit the conversation to hormones alone, we’re leaving a lot of women without answers.
The research is beginning to catch up. Cognitive problems were among the top three priority research questions identified by the global Menopause Priority Setting Partnership in 2024, and longitudinal studies find small but reliable declines in objective memory performance as women transition into perimenopause, and these are not explained by advancing age alone.
Women aren’t imagining this. It’s real, it’s measurable, and it’s finally being taken seriously by the scientific community. The LancetPubMed
But here’s the part that doesn’t get nearly enough airtime: brain fog isn’t always — or even primarily — a hormone problem. For many women, it’s a nervous system problem. And until we address that layer, all the hormone testing and supplement stacking in the world will only take you so far.
The hormone piece is real — but it’s only part of the picture
Let’s give hormones some spotlight time, because they do play a role.
Brain fog in perimenopause happens because fluctuating estrogen and progesterone affect how your brain communicates, fuels itself, and regulates inflammation.
Estrogen helps regulate acetylcholine, serotonin, and dopamine — chemicals needed for memory, mood, and focus. When estrogen drops, these pathways can slow down, leading to forgetfulness and mental fatigue. Dr. Jolene Brighten
Research has shown that menopause is accompanied by measurable structural changes in the brain — and a major 2025 study found connections between the menopausal transition and changes in brain structure, mental health, and sleep, including grey matter shifts in areas tied to memory and emotional regulation. ScienceDaily
So yes. Hormones matter. Estrogen matters. The research is real and it’s important.
But here’s what I want you to notice: almost everything on that list — memory, mood, focus, emotional regulation, sleep — is also directed by your nervous system.
These two systems are not separate stories. They’re deeply woven together. And for many of the women I work with, the nervous system thread is the one that’s been pulled longest.
What’s actually happening in a dysregulated nervous system
Your autonomic nervous system operates in two primary modes: sympathetic (the accelerator — think fight, flight, or freeze) and parasympathetic (the brake — rest, digest, repair, connect). In a healthy, regulated system, these two branches move in and out of balance fluidly. You respond to a stressor, and then you come back down. Your body knows how to return to baseline.
But many of us — particularly women who have spent years overfunctioning, caretaking, people-pleasing, and pushing through — don’t return to baseline. Your nervous system adapts to ongoing stress by staying in a heightened state, and over time that becomes its default setting, even after the original stressor is gone.
This matters enormously for your brain. When your nervous system is stuck in a sympathetic dominant state — the fight/flight/freeze/fawn response — it impairs cognitive function, mental clarity, and brain-body communication.
A dysregulated nervous system gets stuck in protection mode, reducing blood flow to the prefrontal cortex, which is our thinking brain, leading to difficulty with executive function, decision-making, and creative thinking.
Read that again. Your prefrontal cortex — the part of your brain responsible for planning, reasoning, word-finding, and clear thought — gets literally less blood flow when your nervous system is in survival mode. This isn’t a character flaw. This isn’t age. This is physiology.
And it doesn’t have to be dramatic stress. It doesn’t have to be a crisis. A dysregulated nervous system forces your body to live in the past, reacting to old threats as if they are happening right now.
For women with a long history of chronic low-grade stress — years of running too fast, carrying too much, being everything for everyone — the nervous system can stay in this elevated state long after the circumstances that created it have shifted.
Meet the HPA axis: your body’s stress control center
When we talk about why nervous system dysregulation creates brain fog, we have to talk about the HPA axis — the hypothalamic-pituitary-adrenal axis — because this is where stress physiology and cognitive function intersect in a very direct way.
Your HPA axis is your body’s command-and-control system for stress. When you perceive a threat (real or imagined, physical or emotional), your hypothalamus signals your pituitary gland, which signals your adrenal glands to release cortisol.
Cortisol is not the villain here — in the right amounts, at the right times, it’s essential. It helps you respond to challenges, get out of bed in the morning, and manage acute stress.
The problem is chronic activation. Prolonged adverse stress may contribute to HPA axis dysregulation, including altered cortisol rhythm and impaired negative feedback regulation.
Such dysregulation may be associated with cognitive dysfunction through means involving neuroinflammatory responses, oxidative stress, and disturbances in neurotransmitter homeostasis. Studies suggest that these alterations may affect hippocampal structure and function, thereby contributing to impaired learning and memory processes.
The hippocampus. That’s the brain region most associated with memory formation and learning. And it is, as the research describes, “highly stress-sensitive.” Chronic stress triggers prolonged HPA axis activation, resulting in elevated cortisol levels, which can lead to hippocampal atrophy, synaptic dysfunction, and neuroinflammation — recognized as key pathological features of cognitive impairment. nih
Here’s what this means in plain language: years of chronic stress don’t just feel exhausting. They structurally and functionally affect the brain regions you rely on for clear, sharp thinking.
And for women in their 30s, 40s, and 50s? This is often compounding. The hormonal fluctuations of the perimenopausal transition are happening on top of a nervous system that may already be worn from years of carrying more than its share.
The foggy brain you’re experiencing may not be primarily a hormone story at all — it may be the cumulative output of a stress response system that has been running too hot, for too long.
The woman who holds it all together — and what that costs her brain
I want to pause here and speak directly to something I see again and again in my studio.
There’s a particular kind of woman who ends up working with me. She’s not in crisis. She’s not falling apart. She is, by all outward appearances, doing relatively alright. She has a full life, relationships she’s invested in, a career or a business, a household that functions. She’s the woman other people lean on.
She’s also exhausted in a way she can’t quite explain. And she’s often the last to recognize her own nervous system dysregulation — because she’s so practiced at functioning through it.
Nervous system dysregulation shows up differently in this woman than it does in someone in acute crisis. Dysregulation can manifest as difficulty concentrating or brain fog, people-pleasing or fawning, perfectionism, and overworking or underfeeling.
It can look like a woman who’s incredibly productive but feels strangely empty. A woman who’s dialed into everyone else’s needs but oddly disconnected from her own. A woman who does everything “right” by external measures but still feels somehow… off.
That disconnection from self is not a personality trait. It’s a nervous system pattern. And it costs the brain dearly.
When you’re operating in a chronic state of low-grade hyperarousal — always slightly braced, always slightly “on” — your brain’s resources are perpetually being allocated toward vigilance and survival rather than toward clear thinking, creativity, and presence.
Brain fog, in this context, is not a random symptom. It’s information. It’s your body’s way of telling you that something in your system has been running on emergency mode for a really long time.
The vagus nerve: your body’s most important regulation highway
No conversation about nervous system regulation and brain clarity would be complete without talking about the vagus nerve.
The vagus nerve is the longest cranial nerve in the body, wandering from the brainstem down through the neck, chest, and abdomen, touching nearly every major organ along the way — including the heart, lungs, and gut.
It’s the primary nerve of the parasympathetic nervous system, and it functions as the body’s main regulation highway: the pathway through which safety signals travel from the body to the brain and back again.
The vagus nerve is intricately linked to emotional regulation and mental well-being. It serves as a conduit for the gut-brain axis, facilitating communication between the gut microbiota and the brain — a bidirectional communication pathway with profound impact on mood, cognition, and mental health.
Since the gut communicates with the brain through the vagus nerve, gastrointestinal dysfunction can lead to issues such as anxiety, depression, and cognitive fog, creating a feedback loop that affects overall health.
When vagal tone is high — when the vagus nerve is functioning well — the nervous system is flexible. It can move into activation when needed and come back down readily. You can think clearly. You can feel present. You have access to nuance, language, empathy, and creativity.
When the vagal tone is low, the opposite is true. The brake doesn’t work well. The body stays in sympathetic activation longer, recovers more slowly, and the cognitive effects accumulate.
The good news: vagal tone is not fixed. It can be trained, restored, and supported. And this is one of the places where body-based work becomes not just helpful, but genuinely transformative.
Why talking about it isn’t always enough
Here’s something I want to say gently, because I have deep respect for the work of therapy and the power of understanding our own patterns: nervous system dysregulation cannot be fully resolved through insight alone.
You can understand, intellectually, everything there is to know about your stress response. You can identify your patterns, name your triggers, and map your history with precision. And that understanding matters — it truly does.
But many feel that talk therapy intellectualizes pain without fully resolving it. Somatic practices offer something different: immediate feedback — from the body.
Nervous system language like “fight-or-flight” or “regulation” has become common shorthand, reframing anxiety and trauma as physiological experiences, not just psychological ones.
The nervous system is not primarily a cognitive organ. It doesn’t primarily communicate through language and logic. It communicates through sensation, breath, posture, movement, and touch. Which means that if we want to regulate it — truly regulate it, at a cellular level — we have to speak its language.
This is the heart of somatic healing. And it’s why the body-based work I do is not a complement to the “real” healing — it is often the doorway to it.
What body-based work actually does for your brain
Craniosacral therapy works with the craniosacral system — the membranes and cerebrospinal fluid that surround and nourish the brain and spinal cord. Through gentle, precise touch, the work supports the release of tension patterns held in the tissues of the body and the central nervous system, helping the system return to a state of greater ease and flexibility.
Craniosacral therapy offers a gentle, evidence-informed approach to supporting the vagus nerve, improving nervous system regulation, and promoting recovery from trauma. By targeting neurological, cardiovascular, respiratory, and digestive functions, it helps achieve better physical health, emotional resilience, and overall well-being. Ui Greece
When the nervous system begins to find its way back toward regulation — when the HPA axis settles, when vagal tone improves, when the body no longer has to dedicate its resources to survival — cognitive clarity often follows naturally. Not because we’ve done anything directly to the brain. But because we’ve addressed the conditions that were making clear thinking impossible.
Women often describe this shift not as a dramatic transformation but as a gradual returning. Words come back. The fog begins to lift. They feel present in their bodies in a way they hadn’t realized they’d lost. They can think again — not because something was added, but because something that was chronically in the way was finally given a chance to release.
What you can begin doing right now
While working with a practitioner can accelerate and deepen this process, there are meaningful things you can begin exploring on your own. These are not hacks or quick fixes — they’re practices that, done consistently and with genuine presence, begin to shift the nervous system over time.
Physiological sigh. This is one of the fastest-acting nervous system regulation tools we know of. A double inhale through the nose (short inhale, then a top-up inhale), followed by a long, slow exhale through the mouth.
It deflates the small air sacs in the lungs that collapse under stress, rapidly activating the parasympathetic response. Even two or three of these can shift your state meaningfully.
Orienting. This is a practice drawn from Somatic Experiencing. Simply pause — wherever you are — and slowly let your gaze move around the space you’re in. Notice what’s actually here. What’s in front of you, what’s to the side, what’s behind.
This activates the ventral vagal system, which is responsible for the sense of safety and social engagement. It sounds almost embarrassingly simple. It is also genuinely effective.
Touch and warmth. Placing both hands over your heart, warming your hands first and then resting them on your sternum or belly, activates the vagus nerve and sends safety signals through the body. This is not metaphorical.
The nerve endings in the skin respond to warmth and gentle pressure in ways that directly influence nervous system state.
Slow, rhythmic movement. Walking — particularly walking in nature, at a pace that allows you to actually see and hear what’s around you — is one of the most underestimated nervous system regulation tools available. Not walking to get somewhere. Walking to be somewhere.
Rest without guilt. I say this knowing it’s not simple: for women whose nervous systems are wired around productivity and performing, genuine rest can feel almost transgressive.
But sleep and restoration are not luxuries — they are the primary conditions under which the nervous system repairs itself and the brain consolidates memory and clears metabolic waste.
If your sleep is disrupted, that disruption is both a symptom and a perpetuating cause of everything we’ve been talking about.
A word about the fog lifting
I want to come back to the woman on my table.
Over the weeks we worked together, something shifted. Not all at once — this work rarely happens all at once. But slowly, the fog began to thin. She started noticing small things: she could finish a thought. She was finding words again. She felt, as she put it, “like I’m back inside my own life.”
She hadn’t overhauled her diet or started a new supplement protocol. She hadn’t changed her circumstances dramatically. What changed was her nervous system’s relationship to those circumstances. What changed was that her body — for the first time in a long time — began to genuinely feel safe enough to think.
That is not a small thing. That is, in fact, everything.
The brain fog you’re experiencing is not who you are. It is not an inevitable feature of your age or your stage of life. It’s a signal. And signals, when you know how to read them, point the way home.
If you’re ready to begin that conversation — with your own body, and with someone who can help you listen — I’m here.
Ever experienced this? Tell me about it below — I read everything!
Serenity is the founder of RELEASE Embodied Wellness, offering Craniosacral Therapy, Mayan Abdominal Therapy, and one-on-one coaching for women navigating hormonal health, nervous system regulation, and the quiet transitions that don’t come with a roadmap. To explore working together, check her work out here.
