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Is this brain fog? Memory and focus in midlife

Walked into a room and forgotten why? Lost a word halfway through a sentence? Re-read the same email three times? You’re in very good company, and the research is more reassuring than the 3 a.m. worry spiral.

5 min readUpdated Oct 2026Evidence-checked · sources listed

Information for better conversations, not a diagnosis. This is research with sources, not medical advice. Talk to your clinician about your situation.

What people mean by “brain fog”

“Brain fog” is the everyday name for the thinking and memory changes many women notice around menopause.1 Researchers describe it as common in midlife women, and say it goes beyond memory: women describe trouble with a broad range of thinking skills, not just recall.1

If that sounds familiar, the first thing to know is that you’re not imagining it, and the research below is largely reassuring.

What the research actually shows

The best long-term data come from the Study of Women’s Health Across the Nation (SWAN), which followed 2,362 women for four years and repeatedly tested their processing speed and memory. Normally, people score a little better each time they take the same test, because they learn it. During perimenopause, that learning boost stalled: women didn’t improve with practice the way they had before. After menopause, the improvement came back to premenopausal levels. The researchers concluded that these difficulties may be time-limited.2

A 2024 review in Menopause, the journal of The Menopause Society, sums up the wider evidence: studies that follow women over time find small but reliable declines in memory performance as they enter perimenopause, and these aren’t explained by aging alone. Even when declines happen, scores stay within the normal range for all but a very small number of women.1

So the honest summary is: the change is real, it is usually small, and for most women it eases after the transition.

Why it might happen

Researchers think several things overlap. Falling and fluctuating estrogen is one. Menopause symptoms are another: an International Menopause Society white paper on cognition reviews the role of both estrogen and symptoms such as hot flashes, poor sleep and low mood.31

  • Hot flashes. In a small, preliminary study of 14 postmenopausal women, more hot flashes measured by a monitor (not just reported) were linked with worse verbal memory scores. The authors say larger studies are needed.4
  • Sleep. The National Institute on Aging lists sleep problems among the factors that can cause memory problems.5 If night sweats are waking you, our sleep and night sweats guide covers what has evidence behind it.
  • Mood and stress. Depression, anxiety and major stressful life events can also affect memory, according to the NIA.5 More guides on mood are on the way; see our Guides page.

Other things worth ruling out

Not every memory change is about hormones. The NIA lists other factors that can cause memory problems, including:5

  • Thyroid, kidney or liver problems
  • Side effects of medications
  • Low levels of nutrients such as vitamin B12
  • Alcohol or drug misuse
  • Head injury, such as a concussion

The NIA notes that memory problems caused by conditions like these usually go away once the condition is treated.5 That is a good reason to mention brain fog to your clinician rather than quietly putting up with it.

When to get checked sooner

The NIA says that occasionally misplacing things or forgetting something is usually a sign of mild forgetfulness, not a serious memory problem.5 It says serious memory problems are different: they make it hard to do everyday things such as driving, using the phone, and finding your way home. Signs it may be time to talk with a doctor include:5

  • Asking the same questions over and over
  • Getting lost in places you used to know well
  • Having trouble following recipes or directions
  • Becoming more confused about time, people and places

If you or someone close to you notices changes like these, don’t wait for menopause to “pass.” Book an appointment.

Does hormone therapy help?

It’s a fair question, and the research has moved on since the early 2000s. Here’s where it stands in 2026.

What the experts say. Hormone therapy isn’t a memory treatment. The Menopause Society’s 2022 statement says it’s not recommended at any age to prevent or treat a decline in thinking skills or dementia.6 The International Menopause Society’s 2025 recommendations say the same, with one exception: women whose menopause came early.7 The UK’s NICE tells clinicians not to offer it to prevent dementia.8

What the newer research shows. There’s reassuring news, too. The Menopause Society notes that three large randomized trials found neutral effects on thinking when hormone therapy was started soon after menopause.6 In the International Menopause Society’s words, it “neither improves nor harms” thinking in those early years. The Society adds that a 10-year follow-up of one of those trials found no long-term effects on thinking.7

The old worry came mostly from the Women’s Health Initiative Memory Study. It enrolled women 65 and older, and starting one combined regimen at that age raised dementia risk.6 In November 2025, the FDA asked makers to remove the “probable dementia” warning from hormone therapy labels. It said those studies enrolled women “much older than women starting” hormone therapy.9 The FDA didn’t add memory as a use, though.9 Its consumer page still says not to use hormone therapy to prevent memory loss or Alzheimer’s disease.10 And in April 2026, The Menopause Society’s medical director said a large new study supports “current guidelines that recommend against the use of hormone therapy for prevention of dementia.”11

Where hot flashes and sleep come in. A 2026 guide for clinicians in the British Menopause Society’s journal says brain fog is typically linked to poor sleep, hot flashes and mood changes.12 ACOG’s 2026 guideline gives its strongest rating to hormone therapy for hot flashes and for the sleep problems they cause.13 It also says it’s unclear whether hormone therapy helps sleep in women without hot flashes.13 Whether easing night sweats also clears the fog hasn’t been tested. The International Menopause Society says the effect on thinking in women with moderate-to-severe hot flashes, and in perimenopause, is still unknown, because those trials haven’t been done.7

The honest bottom line. Hormone therapy isn’t a way to protect your memory, and the newest guidelines haven’t changed that. But for women who start it near menopause, the trials are reassuring for thinking: no boost, and no harm. If hot flashes and broken sleep are part of your fog, that’s a fair thing to raise with your clinician. See our hormone therapy guide for the bigger picture.

What you can do now

Midlife is a good time to look after your brain for the long haul. The 2024 review in Menopause says clinicians can counsel women about modifiable risk factors, such as high blood pressure and an inactive lifestyle, that can influence thinking and memory as we age.1

Exercise is one of the easiest to act on: US physical activity guidelines say regular activity reduces the risk of dementia, including Alzheimer’s disease.14

  • Get your blood pressure checked, and ask whether anything else in your health could be affecting your memory.
  • Rate your brain fog each day for two weeks alongside sleep, hot flashes and mood. Our tracker has a row for it. Patterns help your clinician see what might be driving it.
  • Be kind to yourself. The NIA suggests memory tools such as to-do lists, calendars and notes; using them isn’t a failure.5

Sources

  1. Maki PM, Jaff NG. Menopause and brain fog: how to counsel and treat midlife women. Menopause, 2024. pubmed.ncbi.nlm.nih.gov
  2. Greendale GA et al. Effects of the menopause transition and hormone use on cognitive performance in midlife women (SWAN). Neurology, 2009. pubmed.ncbi.nlm.nih.gov
  3. Maki PM, Jaff NG. Brain fog in menopause: a health-care professional’s guide for decision-making and counseling on cognition (International Menopause Society white paper). Climacteric, 2022. pubmed.ncbi.nlm.nih.gov
  4. Maki PM et al. Hot flashes are associated with altered brain function during a memory task. Menopause, 2020. pubmed.ncbi.nlm.nih.gov
  5. National Institute on Aging. Memory Problems, Forgetfulness, and Aging. www.nia.nih.gov
  6. The Menopause Society. The 2022 hormone therapy position statement. Menopause, 2022. pubmed.ncbi.nlm.nih.gov
  7. International Menopause Society. Panay N, Fenton A, Hamoda H, et al. International Menopause Society (IMS) recommendations and key messages on women’s midlife health and menopause. Climacteric, 2025;28(6):634–656. PMID 41433054. pubmed.ncbi.nlm.nih.gov (full recommendations: www.imsociety.org)
  8. National Institute for Health and Care Excellence. Menopause: identification and management (NG23). Last updated April 2026. www.nice.org.uk
  9. US Food and Drug Administration. FDA requests labeling changes related to safety information to clarify benefit/risk considerations for menopausal hormone therapy. November 10, 2025. www.fda.gov
  10. US FDA Office of Women’s Health. Menopause. www.fda.gov
  11. The Menopause Society. Longer reproductive span linked with slower rates of cognitive decline (press release). April 15, 2026. menopause.org
  12. Abernethy K, Gurvich C, Spector A, et al. Menopausal ‘brain fog’ or dementia? A practical guide for clinicians. Post Reprod Health, 2026;32(3):217–221. PMID 42678390. pubmed.ncbi.nlm.nih.gov
  13. ACOG Clinical Practice Guideline No. 13: Management of Menopause-Related Vasomotor, Sleep, and Mood Symptoms. Obstet Gynecol, 2026;148(5):e345–e369. PMID 42878500. doi:10.1097/AOG.0000000000006428. www.acog.org
  14. US Department of Health and Human Services. Physical Activity Guidelines for Americans: Top 10 Things to Know. odphp.health.gov

Information for better conversations, not a diagnosis. We’re not clinicians; we read the research and show our sources. See our disclaimer.