Brain Fog During Menopause: Why It Happens, How Long It Lasts and What Helps

Brain fog is the everyday word for the forgetfulness, word-finding trouble and difficulty concentrating that many women notice around menopause. It is very common: The Menopause Society says 40 to 60 percent of midlife women report symptoms like these during the menopause transition. Research suggests the changes are usually mild and, for most women, temporary: in a large US study, the dip seen during perimenopause recovered after menopause. Sleep, mood and hot flashes can make it feel worse, and simple habits, a short diary and a conversation with your doctor can help.

What does brain fog feel like?

Brain fog is not a medical diagnosis but a name for a cluster of experiences: forgetting words, names or numbers, losing focus, and being easily distracted.

Women often describe it like this:

• Words on the tip of your tongue — a familiar word or name simply won't come.
• Forgetfulness — misplacing things, forgetting why you walked into a room, or what you were about to say.
• Trouble concentrating — losing track while reading or listening, rereading the same paragraph.
• Mental fatigue — a "fuzzy" head that makes thinking feel slower and more effortful.
• Harder multitasking and planning — juggling several things at once feels harder than it used to.

It can range from fleeting and mild to something that gets in the way of work and daily life. And it can be frightening. The Menopause Society notes that these symptoms often cause anxiety, frequently because of an unnecessary worry that they are early signs of dementia.

How common is brain fog around menopause?

Very common. The Menopause Society says 40 to 60 percent of midlife women report cognitive symptoms such as forgetfulness during the menopause transition.

A large US survey gives a sense of how it changes with each stage. In the SWAN study (Study of Women's Health Across the Nation), forgetfulness was reported by 31% of women before menopause, 44% during perimenopause and 42% after natural menopause. Even after taking into account age, health habits, anxiety, low mood and poor sleep, women in perimenopause were 1.4 times as likely to report forgetfulness as women who were still premenopausal.

The NHS also lists poor memory and brain fog among the symptoms of menopause and perimenopause. Brain fog rarely comes alone: it often sits alongside tiredness, poor sleep and mood changes, which is why our article on whether perimenopause can cause fatigue may also be useful.

Is it permanent—and is it a sign of dementia?

For most women, research suggests it is temporary.

In the SWAN study, researchers tested more than 2,300 women's memory and thinking speed over four years. Normally people score a little better each time they repeat these tests. During perimenopause, women lost that improvement in processing speed and verbal memory—but after menopause it returned to premenopausal levels, which the researchers say suggests that these difficulties may be time-limited.

A later review of the research described the effect of perimenopause on thinking as both transient and subtle: not a decline, but a pause in the usual improvement. Complaints about concentration and memory can still continue into the first years after menopause.

What about dementia? The Menopause Society says that changes in thinking during perimenopause are typically mild and within normal limits, and that dementia at midlife is very rare. That said, the society also advises bringing any obvious changes to a healthcare professional, so that anything contributing to them can be looked into and treated.

What can make brain fog worse?

Poor sleep, tiredness, low mood, anxiety and hot flashes can all make brain fog feel heavier—even though none of them fully explains it.

• Poor sleep and tiredness. The NHS notes that memory and concentration problems may feel worse if you have sleep problems and feel very tired. Women's Health Concern, the patient arm of the British Menopause Society, says that untreated poor sleep can make emotional and cognitive symptoms feel even worse. If falling asleep has become a struggle, our guide on trouble falling asleep during menopause looks at why.
• Low mood and anxiety. In SWAN, depressive and anxiety symptoms had a small negative effect on thinking speed. Researchers have also pointed out that memory complaints in perimenopause may be linked to anxiety or low mood, so it is worth looking at both together.
• Hot flashes and night sweats. Small studies have found that women who had more hot flashes measured by a monitor—not just the ones they noticed—did worse on verbal memory tests. The evidence is still limited, and researchers say the question is still open. Our article on hot flashes and night sweats covers what can help with these.

It is also worth knowing what did not explain the dip: in SWAN, sleep problems and hot flashes did not account for the temporary change in learning seen during late perimenopause. In other words, the dip was not simply the result of bad nights or hot flashes—and it is not a sign that you are doing something wrong.

What helps with brain fog day to day?

There is no single fix, but practical memory aids, sleep, movement, stress relief and staying socially and mentally active are the measures health organisations suggest.

Make life easier for your memory

• Write to-do lists and break tasks into small steps.
• Use calendar reminders, and ask people to send important information in writing instead of relying on memory.
• Do one thing at a time and take breaks.

Look after the basics

• Keep to a regular sleep routine and get plenty of rest.
• Exercise regularly—for example walking, aerobic exercise or yoga—and get some fresh air. Our guide to exercise during menopause has ideas that fit this stage of life.
• Try something that helps you relax, such as yoga, tai chi, meditation or mindful breathing.
• Don't smoke, and keep alcohol within the recommended limits.

Keep your brain and your social life active

• The Menopause Society lists staying physically and mentally active, keeping a wide social network, a Mediterranean-style diet, not smoking, drinking alcohol only in moderation and looking after blood pressure, blood sugar and cholesterol among the habits that may benefit memory.
• Learning something new in any way you enjoy—reading, a podcast, a new skill—counts too.

Be honest with yourself about the evidence: these are low-risk habits that support your overall health, not a guaranteed cure for brain fog.

What about hormone therapy, medicines or supplements? Neither The Menopause Society nor the UK's National Institute for Health and Care Excellence (NICE) recommends hormone replacement therapy (HRT) to prevent or treat a decline in memory and thinking, or to prevent dementia. If you are considering treatment for other menopause symptoms, talk it through with your doctor. Talk to a doctor or pharmacist before taking any supplement or herbal product, too.

How to keep a brain fog diary

A few weeks of short notes can show whether your brain fog follows a pattern—and give your doctor something concrete to look at.

What to write down:

• What happened: lost a word, forgot an appointment, couldn't focus on a task;
• When: the time of day and the date;
• How strong: mild, moderate or strong; whether it got in the way of work or daily tasks;
• What came before: a bad night, a night sweat, a stressful day, alcohol the evening before, a skipped meal;
• How you slept: roughly how long, and how many times you woke;
• Your mood: low, anxious, irritable or fine;
• Your cycle: if you still have periods, the dates of your period, so you can see whether the fog clusters around them.

In the Menoup app you can log "Brain fog", "Concentration", "Memory lapse" and "Word-finding" as symptoms, with an intensity and triggers such as "Lack of Sleep", "Stress", "Alcohol" or "Period". Your sleep and cycle have their own diaries, so you can see them side by side. Mona, the app's AI companion, can look at your recently logged symptoms with you and share general, evidence-informed information—it isn't a substitute for advice from your doctor.

Questions to ask your doctor

Bringing your diary and a few written questions makes a short appointment more useful. You might ask:

• Could my brain fog be part of perimenopause or menopause?
• Are there other possible causes we should check, such as my thyroid, my blood count or my vitamin B12 level?
• Could any of the medicines I take affect my concentration or memory?
• My sleep is poor—could something like sleep apnoea be playing a part?
• I also feel low or anxious—could that be connected?
• Which options would you suggest for my other menopause symptoms, and could treating them help me think more clearly?
• What changes should make me come back sooner?

When should you see a doctor about brain fog?

See your doctor if memory or concentration problems keep coming back, are getting worse, or are affecting your work or daily life.

Brain fog around menopause is common, but not every memory problem is caused by menopause. The NHS says memory problems can have common, treatable causes such as stress, anxiety or depression, and sleeping problems, and advises against trying to diagnose the cause yourself. Other conditions can also affect concentration or memory—for example an underactive thyroid, vitamin B12 deficiency, sleep apnoea or depression. Anaemia can make you feel tired and low on energy. If you take any regular medicines, mention them too. Talk these possibilities through with your doctor rather than guessing. If you are not sure whether your symptoms are perimenopause at all, Is This Perimenopause—or Is Something Else Going On? walks through other common explanations.

Call your local emergency number immediately if confusion, trouble speaking or finding words, blurred vision or loss of sight, or weakness or numbness on one side of the body comes on suddenly—even if it passes after a few minutes. These are not signs of brain fog; they can be signs of a stroke.

Frequently Asked Questions

Can brain fog start before my periods stop?

Yes. In SWAN, forgetfulness was more commonly reported during perimenopause—while women still had periods, even if irregular—than before it, and measured changes in learning were seen in perimenopause. The NHS lists brain fog among perimenopause symptoms too.

Can anxiety cause brain fog?

Anxiety and low mood can make it harder to concentrate and remember, and in SWAN they had a small negative effect on thinking speed. Researchers recommend keeping the link between mood and memory in mind. If you have felt low, hopeless or lost interest in things most of the day, nearly every day, for at least two weeks, The Menopause Society advises seeing a healthcare professional.

Do supplements help with menopause brain fog?

We haven't found good evidence that any supplement treats menopause brain fog, and none is recommended for it by the health organisations we cite. The NHS advises talking to a doctor before taking herbal supplements or complementary medicines.

Author: Fejsztámer Marianna

Last updated: October 11, 2026

Medical Note: This article is for general information and doesn't replace advice from your doctor. If your memory or concentration problems are getting worse, affecting your daily life or worrying you, please talk to your doctor or healthcare provider. If confusion, speech or vision problems, or weakness on one side of the body start suddenly, call your local emergency number.

References

• Greendale GA, Huang MH, Wight RG, Seeman T, Luetters C, Avis NE, Johnston J, Karlamangla AS. Effects of the menopause transition and hormone use on cognitive performance in midlife women. Neurology. 2009. pmc.ncbi.nlm.nih.gov
• Greendale GA, Derby CA, Maki PM. Perimenopause and cognition. Obstetrics and Gynecology Clinics of North America. 2011;38(3):519–535. pmc.ncbi.nlm.nih.gov
• Greendale GA, et al. Menopause-associated symptoms and cognitive performance: results from the Study of Women's Health Across the Nation. American Journal of Epidemiology. 2010. pmc.ncbi.nlm.nih.gov
• Maki PM, et al. Objective hot flashes are negatively related to verbal memory performance in midlife women. Menopause. 2008. pmc.ncbi.nlm.nih.gov
• The Menopause Society. Perimenopause. menopause.org
• The Menopause Society. Mental Health. menopause.org
• The Menopause Society. The 2022 hormone therapy position statement of The North American Menopause Society. Menopause. 2022;29(7):767–794. menopause.org
• NHS. Symptoms of menopause and perimenopause. nhs.uk
• NHS. Things you can do to help menopause and perimenopause symptoms. nhs.uk
• NHS. Memory loss (amnesia). nhs.uk
• NHS. Depression in adults — symptoms. nhs.uk
• NHS. Underactive thyroid (hypothyroidism) — symptoms. nhs.uk
• NHS. Vitamin B12 or folate deficiency anaemia — symptoms. nhs.uk
• NHS. Iron deficiency anaemia. nhs.uk
• NHS. Sleep apnoea. nhs.uk
• NHS. Symptoms of a stroke. nhs.uk
• National Institute for Health and Care Excellence (NICE). Menopause: identification and management (NG23). nice.org.uk
• Women's Health Concern. Emotional wellness in menopause (factsheet). womens-health-concern.org
• Monash University Women's Health Research Program (HER Centre Australia). Brain fog during menopause transition (factsheet, 2024). cdn-links.lww.com

Not sure whether your brain fog is part of a wider picture? Our free 25-symptom self-test helps you see what you are experiencing in one place.

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