Why women face increased dementia risk

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Alzheimer’s Disease, the most common type of dementia, affects women about twice as much as men. Women are more prone to dementia than men primarily due to a combination of biological, genetic, hormonal, and social factors. While women tend to live longer than men, which increases their risk since age is the biggest risk factor for dementia, longevity alone does not fully explain the higher prevalence among women.

The reasons include:

# The hormone estrogen plays a protective role in brain health, influencing memory and synaptic plasticity. During menopause, estrogen levels drop significantly, which may increase dementia risk.

# Women with the APOE4 gene variant face a higher dementia risk compared to men with the same genetic profile, though the reasons are not yet fully understood.

# Differences in brain structure and immune response may also contribute, with women having a more robust immune response that can lead to increased neuroinflammation linked to Alzheimer’s pathology.

# Social and life experience factors such as historically fewer educational and occupational opportunities that build cognitive reserve might also influence women’s dementia risk.

In summary, women’s greater risk for dementia arises from a complex interplay of longer lifespan, hormonal changes (notably estrogen loss at menopause), genetic factors like APOE4, brain and immune differences, and social determinants.

The studies below highlight how biological sex, gender roles, and social conditions collectively influence the increased dementia risk for women. They underscore the complexity of women’s increased susceptibility beyond simply longer lifespan.

1. Sex and Gender Differences in Alzheimer’s Disease Dementia (2018)
   This review focuses on why women appear to be more affected by Alzheimer’s dementia. It explains that the greater number of women with Alzheimer’s is partly due to longer life expectancy, but sex differences in incidence vary by country and epoch. The paper discusses genetic factors (like APOE4), hormone changes, and social factors such as education disparities. It notes women have a higher prevalence of depression, which is a dementia risk factor, while men have higher rates of sleep apnea. The study emphasizes that mechanisms and risk factors have sex-specific effects.
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2. Sex differences in clinical risk factors for Alzheimer’s dementia (2025)
   This clinical study identifies differences in Alzheimer’s risk factors between men and women. It found notable variations in how risk factors such as cardiovascular disease, depression, and lifestyle behaviors contribute to dementia development by sex. The research highlights the need for sex-specific interventions in Alzheimer’s prevention and treatment.
   Read the full article