 The number of emergency transports due to heatstroke in Tottori prefecture, Japan increased significantly during the summer of 2020 compared to previous years. This increase was likely caused by the implementation of COVID-19-related restrictions which resulted in more people being confined to their homes and unable to cool off. Additionally, the average age of those who experienced heatstroke was much higher than in previous years, indicating that the elderly population was particularly vulnerable to this effect. This article was authored by Shinji Otani, Satomi Funaki Ishizu, Toshio Masamoto, and others.