UN Women technical paper Gender-Differentiated and Age-Specific Risks of Heat Stress in a Warming World: Implications for Equality and Resilience identifies a structural gap in climate vulnerability, showing that heat stress risks are unevenly distributed across gender and age. While rising temperatures affect all populations, the report finds that physiological differences and socially assigned roles combine to increase exposure and mortality risks for women, children, and the elderly.
With 2024 recorded as the warmest year on record, the analysis highlights that the impact of heat is not uniform. Women, particularly in post-menopausal stages, face higher cardiovascular strain and lower sweat efficiency, increasing the risk of heat-related illness. Pregnant women face additional risks, including higher incidence of stillbirths and preterm births.
The report moves beyond biology to identify social and economic drivers of heat risk. Women and girls often bear the "hidden heat burden" of domestic labor, such as long-distance water collection and cooking in poorly ventilated spaces.
In the professional sphere, while men face acute risks in construction and agriculture, women in manufacturing (notably textiles) are exposed to extreme indoor temperatures. By 2030, heat stress is projected to cause 80 million job losses, threatening to widen the gender wage gap.
UN Women calls for an immediate shift toward "gender-responsive" heat safety standards and equitable access to cooling infrastructure.
Key Vulnerability Markers
Physiological Variance: Men generally have higher sweat rates but face acute occupational illness; women face greater cardiovascular strain and higher overall heatwave mortality.
Reproductive Crisis: Heat exposure is linked to lower male fertility and a significant rise in miscarriage and birth defects for pregnant women.
The "Care" Burden: Women and girls spend more time on household chores (water, cooking) in high-heat environments, reducing educational and economic opportunities.
Elderly Isolation: Elderly women are the most vulnerable group due to reduced thermoregulation and the high prevalence of social isolation.
Economic Toll: Projected loss of 80 million jobs by 2030, with marginalized women in subsistence farming and manual labor being hit hardest.
Institutional Gaps: Most current heat action plans lack specific protocols for pregnant employees, nursing mothers, or gender-segregated cooling centers.
What is "Thermoregulation"?
Thermoregulation is the body's internal thermostat that keeps its temperature at a safe level (around 37°C), regardless of how hot the environment is. The body does this primarily through sweating (evaporation) and increasing blood flow to the skin.
As the UN Women report explains, this process is not the same for everyone. Men typically sweat more, which helps them cool down faster during heavy labor. Women, especially as they age or during pregnancy, may have a "delayed" sweat response or higher cardiovascular strain, meaning their bodies have to work much harder to stay cool, increasing the risk of heat stroke.
Policy Relevance
Refines Heat Action Plans (HAPs): The report provides a scientific basis for Indian states to update their Heat Action Plans to include gender-specific sections, such as "cool shelters" specifically for pregnant and lactating women.
Informs Workplace Safety: Findings on indoor heat stress in the textile and garment sectors are critical for India's labor department to mandate ventilation and hydration standards in MSME factory clusters.
Aligns with Jal Jeevan Mission: The link between water collection and heat stress underscores the urgency of providing piped water connections, which directly reduces the time women spend exposed to direct solar radiation.
Guides Maternal Health Policy: By identifying heat as a driver of stillbirths, the report encourages the Pradhan Mantri Surakshit Matritva Abhiyan to include heat-safety counseling during prenatal checkups.
Targets Vulnerable Elderly: The data on elderly mortality encourages urban local bodies to develop "buddy systems" or community outreach for the millions of elderly women living alone in high-density urban "heat islands."
Follow the Full Report Here: UN Women: Gender-Differentiated and Age-Specific Risks of Heat Stress