Menopause Brain Fog: Unpacking Cognitive Challenges
When discussing brain fog in the context of the menopause transition, individuals often describe a pervasive lack of focus, sluggish thinking, and frequent forgetfulness. Research indicates that approximately three out of every five women in midlife encounter difficulties with recalling words and numbers, necessitating the use of lists and reminders, and occasionally forgetting the purpose behind their actions.
The Role of Oestrogen in Cognitive Function
Declining oestrogen levels are frequently identified as the primary cause of these cognitive issues. Oestrogen plays a crucial role in regulating serotonin and dopamine, the natural brain chemicals that influence mood and key cognitive functions such as memory and concentration. Brain fog is a common experience during perimenopause, even among women who maintain adequate, high-quality sleep. Although these changes can be distressing, they are typically temporary and tend to improve following a woman's final menstrual period.
Sleep Disruptions and Their Impact
Minor cognitive challenges can become significantly more pronounced when sleep quality is compromised, leading to symptoms of confusion or forgetfulness. Many women undergoing the menopause transition struggle with falling asleep, often experiencing frequent awakenings and less restful nights. Insomnia is closely linked to diminished cognitive performance and tends to persist beyond menopause itself. Post-menopausal women report much higher rates of insomnia compared to men or pre-menopausal women.
The risk to brain health appears to be more closely tied to sleep quality—specifically, how fragmented sleep is—rather than the total number of hours slept. This connection may explain why night sweats are associated with poorer cognitive performance. Fortunately, addressing night sweats through hormone therapy or effective alternative treatments can enhance sleep quality, thereby supporting better brain health and function.
Hormone Therapy and Long-Term Brain Health
Emerging evidence suggests that hormone therapy, when initiated early in perimenopause and maintained long-term, may offer protective benefits against dementia in later life. However, further studies are required to confirm these findings definitively.
Distinguishing Brain Fog from ADHD
Symptoms such as distraction, disorganisation, and difficulty focusing can also be indicative of attention deficit hyperactivity disorder (ADHD). While research on the intersection of menopause and ADHD remains limited, obstetrician-gynaecologists frequently hear reports from patients. It is not uncommon for women in the menopause transition to experience a worsening of existing ADHD symptoms or to receive an ADHD diagnosis for the first time.
Fluctuating oestrogen levels and subsequent changes in other brain chemicals may exacerbate ADHD symptoms during midlife. Additionally, women with ADHD may be more susceptible to mood disorders throughout the menopause transition.
Normal Ageing Versus Early Dementia
During perimenopause, about seven in ten women report memory-related issues, which can be particularly concerning for those with family histories of early dementia or who have encountered media reports linking menopausal symptoms to dementia risk. Differentiating between normal ageing and early dementia is essential. Key distinctions include:
- Memory Changes: Normal ageing might involve occasionally forgetting a name or appointment but recalling it later, whereas possible dementia could involve forgetting recently learned information or repeating questions.
- Familiar Tasks: Normal ageing may require occasional assistance with technology, while possible dementia might lead to difficulties with dressing, following recipes, or managing bills.
- Communication: Normal ageing can involve trouble finding the right word, but possible dementia may result in forgetting simple words or struggling to follow conversations.
If you or a family member have concerns about cognitive function, consulting with an obstetrician-gynaecologist is advisable. Prior to the appointment, tracking changes in memory and thinking can provide valuable details for discussion.
Addressing Underlying Causes
Your doctor may explore other potential factors contributing to cognitive symptoms, such as untreated anxiety or depression, stress, sleep deprivation, thyroid disorders, or vitamin B12 deficiency. To support long-term brain health, managing chronic conditions like diabetes and high blood pressure is crucial. Factors such as persistently high blood pressure, elevated cholesterol, excess belly fat, and poor cardiovascular health in midlife are all associated with an increased risk of dementia later on.
Additionally, having your hearing checked is important, as poor hearing is a risk factor for cognitive problems, possibly due to reduced brain stimulation. If physical health causes are ruled out, your obstetrician-gynaecologist can refer you to a mental health professional or neurologist for further evaluation.
Excerpted from Menopause: What Your Ob-Gyn Wants You to Know (© 2026 by the American College of Obstetricians and Gynecologists; ISBN 978-1-948258-63-0), published January 31, 2026. Reprinted with permission.
