In the October 15, 2024, issue of JACC, Dr. Valentin Fuster highlights a crucial study revealing that the prevalence of diagnosed atrial fibrillation in the U.S. has surged to at least 10.5 million adults, driven by factors like aging, obesity, and diabetes. With a call for improved prevention and treatment strategies, experts stress the urgent need for public health initiatives to tackle this growing burden on the healthcare system.