Perimenopause Brain Fog: Why You Lose Words, and What Actually Helps

You are mid-sentence and the word simply goes. An ordinary word, like "spade". You walk into the kitchen with total conviction, stand there for thirty seconds, and leave. If this is you, you are in very good company, and you are not losing your mind.

What is actually happening

Oestrogen does a lot of quiet work in the brain. It supports the areas that store and fetch memories and the ones that plan, focus and juggle several things at once. In perimenopause, oestrogen swings up and down before it settles lower, and those systems feel it. Finding words gets slower. Holding eight things in your head becomes holding three.

This is real and it can be measured. A large American study that followed more than 2,000 women found that learning dipped during perimenopause and then recovered afterwards.

It is not dementia

This is the fear most women never say out loud. Menopausal brain fog has a different cause from dementia, affects thinking in a different way, and for most women it is temporary. If the worry will not leave you alone, take it to your GP. Reassurance from a professional beats reassurance from a blog every time.

Two places to start

1. Write it down, without shame. A notebook, a notes app, a whiteboard in the kitchen. Your short-term storage is running low, so give it an external drive.
2. Protect your sleep. Fog and broken sleep feed each other. A cooler bedroom, no phone by the bed and less evening alcohol all help.

Start with those two. They cost nothing and you can do both today.

The brain fog chapter of Hot Fog & Absolutely Fine has four more, including what HRT can and cannot do for your memory. It also has a weekly page for tracking the fog, and the exact sentence to say to the one person who needs the honest version.

The part nobody mentions

Many women describe their thinking in their late fifties and sixties as clearer than it was in perimenopause. The fog lifts. The words come back. The keys are in the pocket of the coat.

This is taken from Hot Fog & Absolutely Fine, our funny, honest workbook for perimenopause, menopause and beyond: 301 printable pages of plain-English answers, pages to hand to the people you live with, quizzes, bingo and cartoons. Every medical claim is checked against the UK's NICE guidance (April 2026). See what's inside.

This article is for information and encouragement. It is not medical advice. Please speak to your GP or a menopause specialist about your own symptoms.