Like all the organs of the body, the heart requires a constant blood supply. This comes from two large blood vessels, the left and right coronary arteries.
Sometimes these arteries can become narrow and hard when fatty deposits called plaques build up. Having narrowed arteries is described as atherosclerosis. People with atherosclerosis of the coronary arteries are described as suffering from coronary heart disease.
The main risk factors for coronary heart disease are smoking, a high fat diet, obesity and old age.