Brain fog in perimenopause: is it real and what helps?

Key takeaways

• Brain fog is one of the most commonly reported symptoms of perimenopause, and it is measurable, not imagined.
• In a large study of over 2,300 women, the normal improvement in learning seen with repeated testing slowed during perimenopause and returned after menopause.
• Menopausal brain fog is usually temporary and is not the same as dementia.
• Sleep loss, night sweats, anxiety, low iron, thyroid problems and some medicines are common, fixable contributors.
• There is no single proven brain fog medicine. Hormone therapy is not recommended to prevent dementia.

What does brain fog actually feel like?

The women who sit in front of me describe it in almost the same words: - Walking into a room and forgetting why - Losing a common word in the middle of a sentence, or calling things by the wrong name - Reading the same paragraph three times - Struggling to follow a meeting or juggle several tasks, when you once ran a household, a job and in-laws without a list - Feeling slower, less sharp, less confident at work

For many women this is the most frightening symptom of all. They worry it is early dementia, especially if a parent had it. They stop speaking up in meetings. And then comes the sentence I hear again and again at my desk: "I don't feel like myself anymore."

Is it real, or is it just stress?

It is real. Researchers at Monash University, who work on the thinking and memory side of menopause, describe brain fog as one of the most commonly reported symptoms of perimenopause and menopause, and note that for many women it is their number one complaint.

The best-known evidence comes from the Study of Women's Health Across the Nation (SWAN). Researchers tested 2,362 women aged 42 to 52 again and again over four years. Normally, when you repeat the same test, you do a little better each time, because you learn it. It's like taking the same road to work: by the tenth day you don't need the map. During perimenopause, that learning gain was much smaller. For verbal memory, women in late perimenopause improved only a fraction as much as premenopausal women. The encouraging part: after the final period, learning went back to premenopausal levels.

So yes, stress is part of the picture for many women. But brain fog is not "all in your head" in the dismissive way people say it.

Why does perimenopause affect memory and focus?

Estrogen acts on the parts of the brain that handle memory, attention and mood. When estrogen swings and then falls, the brain needs time to rewire around it. On top of that direct effect, several other things pile on:

The Monash researchers also point out that low iron and autoimmune conditions can be picked up with blood tests, and that sleep and mood should always be checked. That is exactly where I start.

Is it dementia?

In most women with perimenopausal brain fog, no. The Monash team notes that brain fog is usually temporary and often eases soon after the final period, and warns that too many women are referred for dementia assessment unnecessarily.

That said, some signs deserve a proper medical evaluation and should not be put down to hormones: - Getting lost in familiar places - Difficulty managing money or daily tasks you used to handle easily - Family members noticing personality change or repeated questions - Symptoms that keep getting worse rather than coming and going - Memory problems after a head injury, or with new neurological symptoms such as weakness or speech problems

So what actually helps brain fog?

Treat what you can find. This is the most practical step. Improving sleep, treating night sweats, correcting low iron or B12, managing thyroid problems and treating anxiety or depression often lift the fog considerably.

Consider whether hormone therapy fits. If night sweats and poor sleep are driving your brain fog, treating them with menopausal hormone therapy may help indirectly. But the evidence that hormone therapy directly improves memory is unclear, and NICE states that the effect of hormone therapy on dementia risk is not known. The European Menopause and Andropause Society lists dementia prevention among the uses of hormone therapy that the evidence does not support. Any decision is a prescription one after assessment. See Menopausal hormone therapy explained.

Protect your sleep. See Night sweats and waking at 3 am for practical steps and CBT for insomnia.

Build brain health habits. Researchers describe midlife as a window to build brain health and reduce later dementia risk. Regular physical activity, strength training, social contact, learning new things and limiting alcohol all support this. In the Monash study, mindfulness was the factor most strongly linked with fewer thinking complaints, though it has not yet been tested as a treatment.

Use systems, not willpower. For now: - Write things down in one place, one phone notes app or one diary, not ten - Use calendar reminders for bills, medicines and appointments - Do one task at a time where possible - Tell a trusted colleague or family member what you are going through

The point is, you are not losing your mind. You are carrying a lot through a temporary storm, and you deserve tools for it.

How I approach this at Dr Tvacha

At Cocoon × Dr Tvacha in Thane West, I take a long consultation to separate the threads: sleep, sweats, mood, iron, thyroid and medicines. I order only the tests your history suggests, and the plan goes after the causes you can change. If anything points to a non-hormonal cause, I refer you appropriately. Read about the Right Stop Programme on our women's health page, and see Anxiety, irritability and mood changes in perimenopause.

Written by

Dr Anagha KarkhanisGynaecologist and Fertility Specialist · Reg. No. 2006/02/1187

Leads midlife women's health at Cocoon × Dr Tvacha, Thane.