# Brain Fog in the Menopause > Why do forgetfulness, word-finding difficulty and poor concentration happen in the menopause? Is brain fog permanent, is it a sign of dementia? What the SWAN study found. Forgetfulness, difficulty finding words and trouble concentrating are common during the menopausal transition; they are commonly called **brain fog**. The question most women ask is: is this permanent, or is it the start of dementia? **In short:** Brain fog is the forgetfulness, difficulty finding words and trouble concentrating seen during the menopausal transition. According to studies it settles by itself in most women after the last period, and in natural menopause it is not a forerunner of dementia. Treating hot flushes and disturbed sleep eases it. Early menopause, or removal of the ovaries at a young age, does however raise the risk of dementia if left untreated. Other causes, such as thyroid disease or B12 deficiency, should also be assessed. **The short answer:** in a natural menopause, the studies show that brain fog **resolves in most women** and is not a sign of dementia. **Early menopause is a different matter** — that distinction is explained further down this page. ## Which abilities are affected? Although the complaint is often described vaguely as "mental fuzziness", the areas affected are fairly specific in the research: - **Verbal memory:** difficulty learning and recalling new words and information. This is the most consistently demonstrated change across the transition. - **Attention and concentration** - **Word-finding difficulty:** the "tip of the tongue" feeling - **Forgetting intentions:** walking into a room and forgetting why - **Difficulty juggling several tasks at once** Brain imaging studies add an interesting detail: after the menopause, women use **more activity in the front of the brain** to reach the same memory performance. The brain does the same job, but it takes more effort — which helps explain why the symptom feels tiring. ## Permanent or temporary? Large, long-running studies such as SWAN show that: - memory complaints and brain fog are reported **most intensely during perimenopause** — the transition itself; - after the final period, as the body adapts to the new hormonal setting, the symptom **resolves on its own in most women**; - SWAN found **no permanent, damaging decline** in women's cognitive function. ## The link with sleep and hot flushes Brain fog rarely appears on its own; it is usually part of a cycle. Night-time hot flushes break up sleep, broken sleep impairs concentration and mood during the day, and anxiety and low mood reduce cognitive performance further. Indeed, **brain fog is markedly more severe in women whose hot flushes are frequent and severe and whose sleep is disrupted.** For that reason it is often more useful to address sleep and hot flushes first rather than the fog directly — see [hot flushes in the menopause](https://www.muratalpay.com.tr/tedaviler/menopozda-ates-basmasi/). ## Is it dementia? How is the distinction made? Most women who become forgetful at this stage worry about Alzheimer's disease. The sources draw a clear line between the two. ### In a natural menopause What happens is the brain adapting to a new hormonal environment. With the menopause, the brain's use of its main fuel — glucose — falls by around **20-25%** and the brain turns to other fuels. This is a **physiological reorganisation; it does not cause dementia in the clinical sense.** ### In early menopause — this part is different **The critical distinction.** Menopause before the age of 40 (ovarian insufficiency), or removal of the ovaries **before the age of 45**, significantly increases the risk of dementia if it is not treated. In women who enter the menopause surgically this increase has been reported as high as **70%**. For this group, guidelines make a **strong recommendation** that hormone therapy be given until the usual age of the menopause — even in the absence of symptoms. ## What helps? - **Treat the accompanying symptoms first:** treating hot flushes, sleep disturbance and mood changes directly relieves the fog. - **Mentally effortful activity,** regular physical activity and **strong social contact** — the approaches with the strongest evidence behind them for preserving memory. - **Cognitive behavioural therapy** and acceptance and commitment therapy: by easing the stress and sleep problems caused by menopausal symptoms, they provide indirect but substantial support. - **Rule out other causes:** thyroid disease, vitamin B12 deficiency, iron deficiency, depression and the side effects of some medicines produce similar symptoms. It is not right to attribute the complaint to the menopause before these are considered. ### Is hormone therapy used for cognition? In women going through a natural menopause, guidelines **do not recommend** starting hormone therapy **solely to improve memory or prevent dementia**; trials have shown neither clear benefit nor harm for that purpose. In early and surgical menopause the situation is as described above. This page is for information. If forgetfulness is making daily life difficult, please see a doctor so that other causes can be assessed before it is put down to the menopause. ## Sources 1. SWAN (Study of Women's Health Across the Nation) — the course of memory complaints across the transition and their resolution after the final menstrual period. 2. British and International Menopause Society guidelines — cognitive symptoms, their link with sleep disturbance, and the place of hormone therapy for this purpose. 3. International guideline on premature ovarian insufficiency (POI) — cognitive impairment and dementia risk in early and surgical menopause, and the hormone therapy recommendation. 4. Long-term cohort studies of oophorectomy — the increase in cognitive impairment and dementia risk after early surgical menopause. The information on this page is based on the national and international guidelines listed above. The page is reviewed whenever those guidelines are updated. ## Practice and Contact Details The information on this page is general. Please speak to your doctor about your own situation. - **Doctor**Op. Dr. Murat Alpay — Specialist in Obstetrics and Gynaecology - **Address**Op. Dr. Murat Alpay Practice, Tekelioğlu Cd. No:51 B Kat:2, Filo Apt., 07160 Muratpaşa / Antalya - **Telephone**0505 351 77 88 - **Hours**Monday – Saturday 09:00 – 18:00 · Closed on Sunday [← All treatments](https://www.muratalpay.com.tr/en/tedaviler/) --- Original page: https://www.muratalpay.com.tr/en/tedaviler/menopozda-beyin-sisi/ Last updated: 2026-09-29 Op. Dr. Murat Alpay — Specialist in Obstetrics and Gynaecology Op. Dr. Murat Alpay Practice, Tekelioğlu Cd. No:51 B Kat:2, Filo Apt., 07160 Muratpaşa / Antalya 0505 351 77 88 · Monday – Saturday 09:00 – 18:00 · Closed on Sunday *This information is for general guidance only and does not replace examination, diagnosis or treatment.*