Heat-Related Deaths Significantly Underreported in U.S., Investigation Reveals
A new investigation by NPR and Boston University indicates that heat-related deaths in the U.S. are significantly undercounted, with the actual number likely five times higher than official federal records. Federal data shows an average of about 1,700 heat-related deaths annually between 2018 and 2025, but the investigation suggests this figure is closer to 9,000 per year. This undercount is attributed to challenges within the U.S. health system in documenting heat's role in fatalities. For instance, Adam Willson, a 27-year-old man with DiGeorge syndrome who died in Tucson, Arizona, in June 2024, likely succumbed to heat-related causes, but his death certificate did not mention it. His mother, Debbie Willson, noted that their swamp cooler broke down during a month of extreme heat, exacerbating their heat sensitivity due to their genetic condition. This case exemplifies how heat's impact often goes unrecorded, contributing to the vast discrepancy between official and estimated figures. 
