When enough plaque builds up, or a clump of it comes loose, to completely block an artery to your heart, it can cause a heart attack. The blockage starves the heart muscle of oxygen and nutrients. That can hurt or destroy it.
You usually feel pressure or pain in your chest, but sometimes in your arm, neck, or jaw too. It might be hard to breathe, and you could be dizzy or nauseated.
Call 911 if you have any of these warning signs.