A heart attack occurs when the blood supply to part of the heart muscle
itself — the myocardium — is severely reduced or stopped.
The reduction or stoppage happens when one or more of the coronary arteries
supplying blood to the heart muscle are blocked. This is usually caused
by the buildup of plaque (deposits of fat-like substances), a process
called atherosclerosis. The plaque can eventually burst, tear or rupture,
creating a "snag" where a blood clot forms and blocks the artery.
This leads to a heart attack.
To learn more about heart attacks, we invite you to visit the
American Heart Association's website.