Women Die More in Heatwaves, But Why?

A recurring pattern during recent European heatwaves shows a disproportionately higher number of female fatalities compared to men. A 2022 study analyzing heat-related deaths across 35 countries found a 56% increase in such deaths among women. Germany, which has recorded nearly 9,800 heat-related deaths by mid-July this year, is witnessing the same trend.

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In general, studies usually show only slightly more vulnerability to heat in women compared to men. It is not really a very strong signal.

Common explanations often point to hormonal differences, suggesting women's bodies are less equipped to handle heat due to lower sweat rates, less surface area relative to body size, and hormonal fluctuations like progesterone affecting body temperature. However, experts like Alexandra Schneider, an environmental epidemiologist at the Helmholtz Centre Munich, largely dismiss this biological determinism. "In general, studies usually show only slightly more vulnerability to heat in women compared to men," she stated, noting that small differences do exist, such as women's lower sweating rate and fat distribution impacting temperature regulation.

Schneider highlights post-menopausal women, especially those with existing heart conditions, as a particularly vulnerable group due to increased cardiovascular risk. Yet, she emphasizes that biological factors are likely not the primary cause. "The living conditions and social environment of women probably represent an even greater risk than hormonal differences," she explained. This perspective is echoed by Toby Mündel, a professor studying extreme human environments, who believes the biological basis for higher female mortality during heatwaves is "oversold." He argues that age, physical fitness, and habitual activity levels are more significant determinants than biological sex alone.

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The living conditions and social environment of women probably represent an even greater risk than hormonal differences.

Mündel points out that while women may sweat less, they compensate through other physiological mechanisms, such as directing blood flow to the skin. The prevailing scientific consensus suggests that societal and environmental factors, rather than inherent biological weaknesses, contribute more significantly to the higher mortality rates observed in women during extreme heat events. This points to a need for targeted public health interventions that address these social and environmental vulnerabilities.

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The impact is 'oversold' when asked if there is a real biological basis for the claim that women are more likely to die during heatwaves.