Memory loss in the menopause
Memory loss associated with menopause comprises poor recollection of recent events (recent recall) or of a while ago (delayed recall). This may manifest as:
- Loss of immediate focus (what was meant to be done)
- Appointments not met
- Misplacement of items
- Time lapses
These are not related to normal cerebral functioning such as learning, deduction and reasoning.
The incidence of memory problems in the menopause transition is reported by up to two thirds of women. It is thought these are transient and do not become chronic postmenopausal issues. There is no evidence that these functional deficits are indicative of dementia or precede neurodegenerative disease1.
Memory problems associated with menopause are multifactorial. The process of menopause transition takes 5-8 years with symptoms described consistently in observation studies (Study of Woman Across the Nation (SWAN) 2. 50-80 % of women experience vasomotor symptoms (hot flushes, night sweats). Hot flushes are associated with hyperintensities on brain imaging and changes in brain function on fMRI. Cognitive symptoms are associated with depression which may also be increased during the perimenopause. Observational studies indicate an increased risk of memory deficits and Alzheimer’s disease associated with premature surgical oophorectomy.
Effects of oestrogen on the brain
There are three common physiological oestrogens (oestradiol, oestrone and oestriol) of which oestradiol (E2) is seen to decline rapidly over the menopausal transition. This decline in E2 has been associated with a number of changes in the brain including cognitive changes, effects on sleep and effects on mood (see AMS Information Sheet: Sleep disturbance and the menopause). The role of oestrogen in cognition is indicated by:
- E2 interacts with the cholinergic, dopaminergic and mitochondrial functions3.
- Oestrogen effects on brain volumes and neuronal connectivity
- Sex differences observed in the risk, onset and severity of neurodegenerative disease such as Alzheimer’s, Parkinson’s and stroke occur4.
- Evidence of E2 interactions in a number of neuropsychiatric disorders including Alzheimer’s disease, schizophrenia, and depression.
- Oestrogen action in the regulation of neuronal survival and neurotrophism5.
- Positive correlation between endogenous oestrogen exposure and cognitive status later in life6.
Effect of oestrogen therapy
Studies indicate mixed effects regarding oestrogen therapy and cognitive function with the hypothesis of a “window of opportunity” postulating that younger age or fewer years since menopause may be associated with positive effects of oestrogen whereas commencement of oestrogen therapy in later years is associated with an increased risk of dementia. The evidence suggests increased harm when oestrogen is given to women with poor baseline cognitive function. The evidence is summarised below:
- Observational data suggest that MHT initiated in mid-life may provide protection against the development of dementia7 .
- The Women’s Health Initiative (WHI) Memory Study (WHIMS) found that women aged over 65 years who commenced combined menopausal hormone therapy (MHT) with conjugated equine estrogens (CEE) and medroxyprogesterone acetate experienced a twofold increased risk of probable dementia8 . The WHIMS -MRI study demonstrated greater brain atrophy in frontal cortical and hippocampal regions in women receiving CEE versus women taking placebo9 . CEE alone had a neutral effect on cognition and brain function in the WHIMS study10. Follow-up after 18 years of women who participated in the WHI CEE alone randomised controlled trial showed a 26% reduction in death due to Alzheimer’s disease11 .
- The postmenopausal brain shows a decrease in hippocampal activation which is related to worse memory performance. The left hippocampus is more active in encoding verbal memory. It recruits the contralateral hemisphere with age, which requires oestradiol connectivity between the left and right hippocampus 12,13. Women who start MHT early show better memory and hippocampal function – more youthful function on memory performance11 . MRI studies indicate that E2 treatment dose-dependently enhances hippocampal volume in postmenopausal women14 with a volume reduction in postmenopausal women not on MHT15 . In addition, it benefits pre-frontal cortex function. The WHI Study of Cognitive Aging (WHISCA) showed that CEE/MPA worsened verbal memory, whereas CEE alone had no influence on cognition16 .
- Assessment of functional MRI changes suggest that there is improved efficiency of brain function during a sustained attention task in postmenopausal females receiving E2 and that during a working memory task, postmenopausal women had increased frontal lobe activation as task difficulty increased following treatment with E2 17,18,19 .
- Four randomized controlled trials of MHT (WHIMSY20, KEEPS21 , ELITE-COG22 and COGENT23) have shown a neutral effect on cognitive function in the early postmenopause. Whereas results from WHISCA, a sub-study of the WHI investigating cognition, indicated that combined MHT had a negative impact on verbal memory but no effect on other cognitive domains in woman older than 65 years16.
- Surgical premature or early menopause increases the risk of Alzheimers by 70%24. If MHT commences before the age of 50, that risk is removed.
- MHT may correct the memory deficit directly, but the improved cognition may be due to improvement in other symptoms that are synergistic in exacerbating the memory loss such as sleep deprivation and hot flushes25,26. Reassurance can be given that such lapses are common and transitory27.
Effect of other therapeutics
- A meta-analysis concluded that adjuvant anti-oestrogen therapy (tamoxifen or aromatase inhibitors) used in breast cancer is associated with impairment in verbal learning/ memory compared with control women either without breast cancer or with breast cancer but not treated with anti-oestrogen therapy. Addition of chemotherapy resulted in greater, although transient, cognitive impairment compared with adjuvant anti-oestrogen therapy alone. Wagner et al28 Observational studies suggest that the risk of dementia is either not increased or is reduced with these agents29.
- Limited evidence suggests that raloxifene, a SERM used to treat osteoporosis, is associated with improvement in verbal memory12.
Advice to women
- At present, it is premature to recommend MHT for cognitive function until more substantiated clinical correlates are available.
- Lessening vasomotor symptoms with MHT or non-hormonal treatments may improve cognitive function.
- Improving sleep, using mnemonic devices or engaging in physical activity may also lessen menopause transition cognitive deficits30.
- Cognitive testing is not indicated unless the symptoms are progressive and interfere with work performance or relationships.
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2. Kravitz HM, Janssen I, Bromberger JT, et al Sleep Trajectories before and after the final menstrual period in the study of women’s health across the nation (SWAN) Curr sleep Med Reports 2017; 235-250.
3. Russell JK, Jones CK, Newhouse PA. The role of estrogen in brain and cognitive aging. Neurotherapeutics 2019;16:649-665.
4. Pertesi S, Couglan G, Puthusseryppady V, et al. Menopause, cognition and dementia – A Review. Post Reproductive Health. 2019; (0) 1-7. DOI:10.1177/2053369119883485.
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6. Matyi JM, Rattinger GB, Schwartz S. et al. Lifetime estrogen exposure and cognition in later life: the Cache County Study. Menopause. The Journal of the North American Menopause Society 26; 12: 1366-1374.
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8. Shumaker, SA, Legault, C, Rapp, SR. et al. Estrogen plus progestin and the incidence of dementia and mild cognitive impairment in postmenopausal women. The Women’s Health Initiative Memory Study: A randomized comtrolled trial. JAMA May 28; 2003. 289(20):2651-2662.
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11. Manson JE, Aragaki AK, Rossouw JE, et al. WHI Investigators. Menopause hormone therapy and long-term all-cause and cause-specific mortality: The women’s health initiative randomized trails. 18 year follow up JAMA 2017; 318: (10) 927-938. DOI:10.1001/jama.2017.11217.
12. Maki PM et al. Perimenopausal use of hormone therapy is associated with enhanced memory and hippocampal function later in life. Brain Research 1379; 232-243.
13. Maki PM, Henderson VW. Hormone therapy, dementia and cognition: The Women’s Health Initiative Study 10 years on. Climacteric, 2012; 15: 256-262.
14. Albert K, Hiscox J, Boyd B, et al. Estrogen enhances hippocampal gray-matter volume in young and older postmenopausal women: a prospective dose-response study. Neurobio Aging 2017;561-566.
15. Goto M, Abe O, Miyati T, et al. 3 Tesla MRI detects accelerated hippocampal volume reduction in postmenopausal women J. Magn. Reason Imaging 2011; 33:48-53.
16. Resnick, S.M., Maki, P.M., Rapp, S.R., et al. Effects of combination estrogen plus progestin hormone treatment on cognition and affect. J Clin Endocrinology Metab 2006, 91:1802- 10
17. Dumas JA, Kutz AM, Naylor MR, et al. Increased memory load-related frontal activation after estradiol treatment in postmenopausal women. Horm Behav 2010;58:929-935.
18. Resnick SM, Espeland MA, Jaramillo SA et al. Postmenopausal hormone therapy and regional brain volumes : the WHMS-MRI study. Neurology 2009; 72:135-142.
19. Kim G-W, Park K, Jeon GW. Effects of sex hormones and age on Brain Volume in PostMenopausal Women J. Sex. Med 2018;15: 662-670.
20. Espeland, MA, Shumaker, SA, Leng, I, et al. Long-term effects on cognitive function of postmenopausal hormone therapy prescribed to women aged 50 to 55 years. JAMA Internal Medicine 2013, 173(15): 1429-1436.
21. Gleason, CE, Dowling, NM, Wharton, W, et al. Effects of Hormone Therapy on Cognition and Mood in Recently Postmenopausal Women: Findings from the Randomized, Controlled KEEPSCognitive and Affective Study. PLoS Med 2015 12(6): e1001833; discussion e1001833.
22. Henderson, VW, St. John, JA, Hodis, HN.,et al. Cognitive effects of estradiol after menopause. Neurology. 2016 Aug 16; 87(7): 699–708.
23. Maki PM, Gast MJ, Vieweg AJ, Burriss SW, Yaffe K. Hormone therapy in menopausal women with cognitive complaints: a randomized, double-blind trial. Neurology. 2007;69(13):1322-1330. doi:10.1212/01.wnl.0000277275.42504.93
24. Georgakis MK, Beskou-Kontou TB, Theodoridis, I. et al. Surgical menopause in association with cognitive function and risk of dementia: A systematic review and meta-analysis. Psychoneuroendocrinology. 106: 9-19.
25. Weber MT, Maki PM, McDermott MP. Cognition and mood in perimenopause: a systematic review and meta-analysis. J Steroid Biochem Mol Biol. 2014;142:92-98. Doi:101016/j.jsbmb.2013.06.00.
26. Maki PM, Zonderman AB, Resnick SM. Enhanced verbal memory in nondemented elderly women receiving hormone replacement therapy. Am J Psychiatry 2001;158: 227-233.
27. Greendale GA, Karlamangla AS, Maki PM. The menopause transition and cognition. JAMA 2020; 323;1495-6. 2020doi.10.1001/jama.2020.1757.
28. Wagner LL, Gray RJ, Sparao JA. et al. Patient-reported cognitive impairment among women with early breast cancer randomly assigned to endocrine therapy along versus chemoendocrine therapy: results from TAILORx. J Clin Onc. 2020;38:1-19. Doi.org/10.1200/JCO.19.01866.
29. Branigan GL, Soto M, Neumayer L et al. Association between hormone-modulating breast cancer therapies and incidence of neurodegenerative outcomes for women with breast cancer. JAMA netw Open 2020;3(3):e201541.doi10.1001/jamanetworkopen.2020.1541.
30. Gava G, Orsili I, Alvisi S. et al. Cognition, mood and sleep in menopausal transition : The role of menopause hormone therapy. Medicina. 2019, 55:668. DOI:10.3390/medicina55100668.
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Content updated July 2020