India, Dec. 6 -- We tend to think heart attacks strike only when an artery is severely clogged, but that's an oversimplified picture. Heart disease is far more complicated and, in many cases, dangerously quiet. Dr Dmitry Yaranov, a Tennessee-based cardiologist who specialises in heart transplants, explains this in his November 29 Instagram post, where he breaks down why the biggest threats often come from hidden plaque, not the large, obvious blockages most people worry about. (Also read: AIIMS neurologist warns 'stop scrolling your phone first thing in morning'; shares how it can affect your mental health )

According to Dr Yaranov, a stress test only tells doctors how the heart performs under physical pressure. It measures blood flow wh...