This is a genuinely frightening experience — and it is one of the most distressing perimenopause symptoms because it threatens professional confidence and raises fears about dementia or serious neurological disease. Please hear this clearly: perimenopause-related brain fog is not dementia, and it does not predict it.

Oestrogen is neuroprotective. It has direct effects on the hippocampus (memory formation) and prefrontal cortex (planning, organisation, verbal recall). As oestrogen fluctuates during perimenopause, these regions don’t function with the same efficiency they did before. Working memory — the ability to hold information in your mind while doing something with it — is often the first and most affected function. This is why you can prepare something thoroughly and then the material seems to dissolve under pressure.

The brain fog is real, it has a biological cause, and for the majority of women it improves after the menopause transition when hormone levels stabilise. This is not a permanent state.

Practical strategies that genuinely help: externalise everything — notes, voice memos, written lists, calendar reminders for things you would previously have held in your head without thinking. Give yourself more preparation time than you think you need. Break complex tasks into smaller, written steps rather than relying on mental organisation.

One important step: ask your doctor for blood tests — thyroid function (TSH + fT4), vitamin B12, ferritin, and vitamin D. All four are common deficiencies in this age group and all cause cognitive symptoms that mimic perimenopause brain fog. Treating a B12 deficiency or thyroid problem, if present, can produce rapid and significant improvement.