There are several coronary arteries which deliver oxygen and nutrients to the heart's own tissue.
Plaque deposits can make the arteries stiff and irregular.
There can be a single blockage or multiple blockages, and they can vary in severity and location. Any narrowing, or blockage, of the coronary arteries reduces the blood supply to the heart tissue, therefore reducing the amount of oxygen and nutrients delivered. This inhibits the normal function of the heart muscle. Symptoms can be triggered by physical exertion, eating, changes in temperature, extreme emotion or may be present even at rest. If this continues, it can starve the heart muscle cells of oxygen and eventually lead to a heart attack.