Exertional heat illness at its extreme may cause heat stroke and altered mental status (confusion, delirium, stupor, or unconsciousness), which can result in organ failure and death. Author Francis G. O'Connor, MD, MPH, discusses heat-related illness in athletes, including risk factors, prevention, symptoms, and management, with JAMA Associate Editor David Simel, MD, MHS. Current NWS Forecast Related Content:

• Heat-Related Illness in Athletes