What is ECG on a smartwatch and how accurate is it?

ECG on a smartwatch records your heart's electrical activity and can spot signs of irregular heart rhythm like atrial fibrillation.

ECG stands for electrocardiogram. It's a reading of your heart's electrical activity. Your smartwatch uses sensors to record this activity and checks if your heart rhythm looks normal or irregular. It's a helpful screening tool that can catch problems early, but it's not a medical diagnosis. Your doctor still needs to confirm anything serious. Think of it like a heads-up system: it can spot when something seems off, but it isn't a replacement for professional medical care.