Coronary heart disease is caused by the buildup of plaque in the arteries to your heart. This may also be called hardening of the arteries.
Fatty material and other substances form a plaque build-up on the walls of your coronary arteries. The coronary arteries bring blood and oxygen to your heart.
This buildup causes the arteries to get narrow.
As a result, blood flow to the heart can slow down or stop.