Why your heart suddenly beats fast, seemingly for no reason: How a racing pulse rate - even when your smartwatch says it is normal - could be the first sign of this life-changing condition... DR ELLIE CANNON

A sudden rapid heartbeat, even if a smartwatch indicates normal readings, may signal an underlying heart condition. The article, written by Dr. Ellie Cannon, highlights how such symptoms could be an early warning of a serious, life-changing health issue.