Heart disease and stroke deaths are falling in the US — but there’s a quiet health threat that’s spreading fast and putting millions at risk. In fact, the problem has grown so widespread that the condition landed its own chapter in the American Heart Association’s 2026 Heart Disease and Stroke Statistics Update , released Wednesday. The numbers paint a grim picture: Nearly 90% of American adults have at least some form of this often silent, deadly disease. Even more alarming, more than 80% of