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Overwhelmed, irritable, dizzy, bloated, exhausted—these are common experiences shared by many women as they face the rising temperatures brought on by recent heatwaves. After barely recovering from a record-breaking heat in June, a growing number of women are preparing for even more intense hot weather conditions. Extreme heat poses health challenges for everyone, but research indicates that heatwaves act as a significant stress test for women’s cardiovascular systems, affecting them more severely than men. Medical experts are raising alarms about this disparity, emphasizing the need for greater awareness and targeted protection measures for women as climate change continues to intensify heatwaves.
Biologically, differences in hormone levels and the body’s response to heat play a crucial role in this increased vulnerability. Women tend to produce less sweat than men and begin to sweat only when their body temperature is higher, which impairs the ability to cool down quickly. This makes it harder for women to recognize when they are overheating, since less visible sweating can mask the body’s distress. Additionally, women typically have higher core body temperatures and greater body fat percentages, which act like an insulating layer and exacerbate heat retention. Hormonal fluctuations during the menstrual cycle, perimenopause, menopause, pregnancy, and breastfeeding further complicate the body’s temperature regulation, putting extra strain on the cardiovascular system during hot weather.
Socioeconomic factors also contribute significantly to women’s susceptibility to heat-related illness. Women are more likely to occupy lower-paid jobs and often bear primary caregiving responsibilities, which can limit their capacity for self-care during heatwaves. Age is another critical factor, as older adults are more vulnerable to heat stress. Women’s longer life expectancy compared to men means more women face these risks, especially since conditions such as dementia, which can interfere with recognizing thirst, and the use of medications like diuretics that affect hydration, are more common in elderly populations. These combined biological and social factors make heatwaves a particularly dangerous time for women’s health.
Furthermore, periods and menopause introduce additional challenges by altering women’s heat sensitivity. During the menstrual cycle, rising progesterone levels can increase core body temperature, heightening discomfort in hot weather. The drop in estrogen levels during menstruation impairs the body’s thermoregulatory efficiency, placing further strain on the cardiovascular system. Women have reported symptoms such as increased fatigue, dizziness, and anxiety during heatwaves coinciding with their periods. Similarly, menopausal women might experience worsened hot flushes and night sweats in extreme heat. Iron loss during menstruation, especially in those with heavy bleeding, can affect oxygen delivery in the body, adding to cardiovascular workload and complicating recovery from heat exposure. These varied physiological and social factors highlight the urgent need for greater attention to women’s health during increasingly frequent and severe heatwaves
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