Brain Fog, ADHD, or Early Dementia? New Research on Cognitive Changes During Perimenopause
Many women in their 40s and 50s describe a frustrating experience: words seem harder to find, multitasking becomes more difficult, concentration feels less reliable, and memory does not seem quite as sharp as it once was.
As a neurologist, I hear these concerns frequently. Many women worry they are developing Alzheimer's disease. Others wonder whether they have developed adult-onset ADHD. Most are relieved to learn that neither explanation is usually correct.
Emerging research continues to support what many women have been reporting for years: cognitive changes during the menopausal transition are real, measurable, and often influenced by hormonal fluctuations, sleep disruption, mood symptoms, and metabolic health.
New Research Provides Important Insights
A recent study published in the Journal of Clinical and Experimental Neuropsychology examined cognitive performance in 202 women between the ages of 40 and 60 using a sophisticated statistical approach known as latent profile analysis.
Rather than identifying a single pattern of "menopausal brain fog," investigators found four distinct cognitive profiles.
Most women performed within normal ranges, but approximately:
39% demonstrated subtle weaknesses in verbal learning and memory
12% showed greater challenges with executive function, attention, and cognitive flexibility
Cognitive differences were not consistent with dementia-level impairment
Women with more sleep disturbances and mood symptoms were more likely to fall into lower-performing cognitive profiles
These findings reinforce the idea that cognitive symptoms in midlife are heterogeneous and influenced by multiple biological and lifestyle factors rather than representing a single disease process.
Processing Speed and Working Memory Appear Most Vulnerable
An updated systematic review and meta-analysis published in Psychology and Aging further examined cognitive performance across reproductive stages.
The investigators found small but measurable declines during perimenopause in several domains:
Processing speed
Attention
Working memory
Interestingly, objective cognitive testing and subjective experiences of "brain fog" do not always align perfectly. Some women perform within normal limits on formal testing while still experiencing significant cognitive frustration in daily life.
This disconnect is important because it validates patients' experiences while also reassuring them that their symptoms are not necessarily indicative of neurodegenerative disease.
Is It ADHD?
Many women present during perimenopause convinced they have developed ADHD later in life.
While some women certainly have previously unrecognized ADHD that becomes more apparent during hormonal transitions, true adult-onset ADHD remains controversial.
What I often see in clinical practice is a combination of:
Sleep disruption
Stress
Anxiety
Mood changes
Hormonal fluctuations
Increased cognitive demands
Together, these factors can create symptoms that closely resemble ADHD, including distractibility, difficulty concentrating, forgetfulness, and reduced executive function.
A careful history is essential because treatment approaches may differ substantially.
Is It Alzheimer's Disease?
The reassuring answer for most women is no.
The cognitive changes associated with perimenopause and menopause are generally subtle, domain-specific, and often reversible or modifiable.
Features that favor menopausal cognitive changes include:
✓ Increased word-finding difficulties
✓ Slower processing speed
✓ Attention lapses
✓ Fluctuating symptoms
✓ Association with poor sleep or vasomotor symptoms
Features that warrant further neurological evaluation include:
✓ Progressive decline over time
✓ Significant impairment of daily function
✓ Repetitive questioning
✓ Getting lost in familiar environments
✓ Strong family history of early-onset dementia
What Should Clinicians and Patients Focus On?
The newest evidence suggests that addressing sleep quality, mood symptoms, metabolic health, physical activity, and vascular risk factors may have a greater impact on cognitive function than many people realize.
When evaluating "brain fog," clinicians should consider:
Sleep disorders and insomnia
Anxiety and depression
Hormonal transitions
Cardiometabolic health
Medication effects
Cognitive screening when appropriate
For many women, improving sleep, managing stress, optimizing exercise, and addressing menopausal symptoms can lead to meaningful improvements in cognitive function.
The Bottom Line
Brain fog during perimenopause is real. Women are not imagining it.
The newest research suggests that cognitive symptoms during midlife most commonly affect processing speed, attention, working memory, and executive function. These changes are often associated with sleep and mood disturbances and are generally distinct from Alzheimer's disease.
As our understanding of women's brain health continues to evolve, it becomes increasingly clear that menopause is not simply a reproductive transition. It is a neurological transition as well.
Understanding that distinction may help many women move from fear toward informed action.
References
Hagy HA, Maki PM, et al. Identifying and Characterizing Cognitive Profiles in Midlife Women Using Latent Profile Analysis. Journal of Clinical and Experimental Neuropsychology. Published online May 14, 2026. PMID: 42130409.
Bangle A, et al. Cognitive Functioning in Perimenopause: A Systematic Review and Meta-Analysis. Psychology and Aging. 2026.
Maki PM, Rubin LH, et al. Cognitive complaints and objective cognitive performance during the menopausal transition. Menopause. Multiple publications.
Weber MT, Maki PM, McDermott MP. Cognition and mood in perimenopause: A systematic review and meta-analysis. Menopause. 2014;21(7):807-822.
Santoro N, Epperson CN, Mathews SB. Menopausal symptoms and their management. Endocrinology and Metabolism Clinics of North America. 2015;44(3):497-515.
About the Author
Dr. Myrna Cardiel, MD, MSCP, DipABLM, DABOM is a board-certified neurologist specializing in headache medicine, women's brain health, menopause-related neurological symptoms, and cognitive resilience. She is the founder of Cardiel Precision Brain Health, a personalized neurology practice serving patients in New York City, Westchester, New Jersey, and Connecticut launching in mid-July 2026.
