You're mid-sentence and the word just...disappears. You walk into the kitchen and stand there for a full thirty seconds, genuinely unsure why you came. You read the same paragraph three times and retain nothing. You used to be sharp. You used to juggle things so easily. You’re a software engineer, a nurse, you run a business.
Now you're googling "early signs of dementia" at 2 a.m.
If this is you, please know, you are not losing your mind. What you are experiencing is one of the most common menopause symptoms: brain fog. Inflammation, hormone imbalances, and insulin resistance are conspiring against you right now to make you feel like you’re losing your mind. But don’t worry, this is usually not permanent, and there are many things you can do to during this transition to get your mental spark back.
Let’s talk about all of it.
What Does Brain Inflammation Feel Like In Menopause?
Menopause brain fog shows up differently for different women. For some, it is word retrieval, that maddening thing where the name of your colleague, your neighbor, or your own sister's husband vanishes mid-conversation.
For others, it is a persistent cognitive heaviness, a sense that thinking requires more effort than it used to. Concentration becomes harder. Memory feels unreliable. The mental agility you once took for granted starts to feel sluggish.
What Causes Menopause Brain Fog
There are many factors that combine to cause this perfect storm of chaos that makes you forget why you went upstairs (spoiler: it was probably to find your cell phone or glasses).
Here are some of the common culprits.
1. Low Progesterone
In perimenopause, progesterone is the first hormone to drop. Many women lose up to 80% of their progesterone during this time. That’s because you mainly produce progesterone only after you ovulate. Stop ovulating, stop progesterone. (1)
Progesterone is neuroprotective. It calms the nervous system, supports myelin (the protective sheath around nerve fibers), and plays a direct role in brain function and mood stability. (2)
So without it, your brain may start to feel the effects.
But that’s not the whole issue.
Topical, bioidentical progesterone can help you gently adjust to this transition. Learn more about my Balance cream here.
2. Neuroinflammation + Estrogen Dominance
So low progesterone can be an issue, for sure.
Where things may also get inflamed in the brain is when you have low progesterone and estrogen that’s high relative to your progesterone levels.
This imbalance is what creates estrogen dominance. So you have low progesterone and high estrogen, even though your estrogen is likely declining as well. We call this estrogen dominance. In other words, it’s low estrogen, even lower progesterone.
Unfortunately, estrogen dominance drives inflammatory signaling throughout the body, including in the brain.
When inflammatory cytokines are elevated, they cross into the brain and disrupt neurotransmitter function, impair glucose metabolism in brain cells, and slow neural communication. (3)
This is how inflammation can cause brain fog in menopause.
Watch the video below for a more thorough explanation of estrogen dominance.
3. Low Estrogen
On the other side of the coin, there are certainly women who notice their brain fog disappears when they get on estrogen hormone therapy, so it would seem that low estrogen is likely a factor.
Now, I’d love to say we have a mountain of scientific evidence that points to low estrogen levels causing brain fog, but we don’t.
What we do know is this:
Estrogen promotes blood flow to the brain, supports the growth and repair of neurons, and regulates several neurotransmitters that are critical for memory and cognitive function. It also plays a role in how efficiently brain cells use glucose for energy.
Women on HRT may still have brain fog
Women with identical estrogen levels can have completely different cognitive experiences…and that likely depends on their inflammation levels, metabolic health, thyroid function, or sleep quality
4. Insulin Resistance
Brain fog may not just be a hormone story. It’s often metabolically driven.
Insulin resistance, which is increasingly common in perimenopause due to the hormonal shifts taking place, compounds neuroinflammation significantly. (4)
When your cells become less responsive to insulin, glucose cannot get into the cells efficiently. For the brain, which runs almost entirely on glucose (unless you’re in ketosis), this is a problem. Brain cells that are energy-deprived become inflamed. Cognitive function suffers.
Insulin resistance and estrogen dominance also reinforce each other in a feedback loop.
Adipose tissue converts androgens into estrogen through a process called aromatization, adding to the circulating estrogen load — and this process increases as insulin resistance and body fat accumulate in perimenopause. (5) More circulating estrogen that is not being properly cleared means more inflammatory estrogen metabolites. More inflammation means more insulin resistance.
The good news: supporting both estrogen clearance and blood sugar regulation has a compounding effect. When you ease the inflammatory burden from one direction, the other starts to improve too.
One of my favorite tools for this is my Keto-Green® Protein Shake. One scoop in the morning can help balance blood sugar and keep you feeling full for hours.
5. Thyroid Dysfunction
Thyroid dysfunction is one of the most commonly missed sources of brain fog. The thyroid and the ovaries are in constant hormonal conversation, and as estrogen and progesterone shift in perimenopause, thyroid function is often affected.
Even subclinical hypothyroidism, where labs look "normal" but the thyroid is underperforming, can produce significant cognitive symptoms, including mental sluggishness, poor memory, and difficulty concentrating. (6) If your brain fog has been persistent and you have not had a thorough thyroid panel (not just TSH, but free T3, free T4, and antibodies), it is worth asking for one.
6. ADHD
ADHD is another factor that often goes unrecognized and unvalidated in midlife women.
Many women with ADHD were never diagnosed because they compensated well for decades, relying on high estrogen levels that support dopamine and norepinephrine, the neurotransmitters that keep attention and executive function online.
As estrogen declines in perimenopause, that compensation disappears, and symptoms that were once manageable can suddenly feel overwhelming. (7) If you have always been a bit scattered, but it is genuinely getting worse, this is a conversation worth having with a provider who understands both ADHD and hormonal health.
7. Stress
Cortisol and adrenal fatigue play a significant role in brain fog and neuroinflammation as well.
During perimenopause, the adrenal glands are asked to pick up some of the hormonal slack as the ovaries begin to wind down.
If your adrenals are already taxed from years of chronic stress, poor sleep, or blood sugar dysregulation, they may not have the reserve to do that effectively. Research has shown that chronically elevated cortisol is directly associated with reduced hippocampal volume and measurable deficits in memory function. (8) In other words: stress shrinks your brain.
And chronically low cortisol, which can result from adrenal burnout, produces its own version of brain fog: a flat, depleted, can't-get-started quality that feels different from inflammation but is equally disruptive.
My most effective tool for adrenal support is hands down Mighty Maca® Plus. It’s formulated with organic maca and dozens of superfoods to help you feel more energetic and less stressed. Learn more about Mighty Maca here.
8. Sleep
The brain does its cellular cleanup during deep sleep via the glymphatic system, a waste clearance network that clears metabolic byproducts, including amyloid beta, a protein associated with cognitive decline. (9)
When sleep is fragmented or insufficient, which is extremely common in perimenopause due to night sweats, anxiety, and progesterone-driven sleep disruption, that cleanup does not happen.
The cognitive debt accumulates quickly. If you’re sleeping poorly for months, you’re not just tired. You’re running on a brain that has not been properly maintained.
For melatonin-free sleep support, check out our Nite-Zzz formula here.
Neuroinflammation And Estrogen Clearance
All of these brain fog and neuroinflammatory causes often coexist.
Suboptimal thyroid function, disrupted sleep, elevated cortisol, ADHD, low progesterone, and estrogen dominance can certainly affect you all at once.
But one of the biggest levers to pull that supports all of this is addressing estrogen clearance.
You see, estrogen does not just do its job and cleanly leave the body. It gets metabolized down different pathways.
When estrogen clearance is working well, used estrogens are processed by the liver in two phases: broken down (Phase 1) and then packaged for safe elimination (Phase 2).
When that process is sluggish or overburdened, incompletely metabolized estrogens recirculate in the body, driving inflammation and contributing to all of the symptoms we have been talking about: brain fog, fatigue, mood instability, and sleep disruption.
This is where sulforaphane comes in. It’s the active molecule your body produces when you consume broccoli sprouts.
Sulforaphane does two things:
It supports Phase 2 detoxification, helping the liver clear estrogen efficiently and cleanly. (10)
It activates a pathway called NRF2, one of the body's master regulators of antioxidant defense and anti-inflammatory response. When NRF2 is activated, the body upregulates its own internal defenses against oxidative stress, which is a significant driver of neuroinflammation. (11)
And that’s why I’ve created Radiance Defense Boost.
It’s a targeted formula that includes ample glucoraphanin, a compound your body converts to sulforaphane.
But what’s really cool is that it also includes horseradish, which contains glucosinolates. They help “activate” the power of the glucoraphanin so you can better clear estrogen.
Vitamin C and folate round out the formula by supporting the methylation pathways that are essential for Phase 2 detoxification.
The result is a formula that supports the root mechanisms behind menopausal brain fog: estrogen that is not clearing efficiently, NRF2 pathways that are not being activated, and an inflammatory burden the brain is being asked to absorb.
What Supporting Estrogen Clearance Can Actually Do
When estrogen clearance improves, a few things tend to shift. The inflammatory load starts to ease. Brain fog begins to lift. Sleep often improves, and with it, a brain that feels more like your own. Mood tends to stabilize. The heaviness starts to feel less constant. Even your skin looks more radiant.
If you are in perimenopause or menopause and experiencing brain fog, cognitive sluggishness, fatigue, or mood disruption, your estrogen clearance pathways almost certainly deserve support.
Brain Fog Is Not Forever
Neuroinflammation is responsive to interventions. Estrogen clearance can be supported. The NRF2 pathway can be activated. The brain, given the right inputs, is remarkably capable of coming back online.
Radiance Defense Boost was formulated specifically to support these pathways.
Click here to join the waitlist and get a special discount on it when it releases!
This post is for informational purposes only and is not a substitute for personalized medical advice. Please consult your healthcare provider for diagnosis and treatment. Any references to supplements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.
