Coronary heart disease
Coronary heart disease (CHD) occurs when your heart muscle's blood supply is blocked or interrupted by a build-up of fatty substances (atheroma) in the coronary arteries.
The coronary arteries are the major blood vessels that supply your heart with blood.
If your coronary arteries become narrow due to a build-up of atheroma, the blood supply to your heart muscle will be restricted. This can cause angina (chest pains).
If a coronary artery becomes completely blocked, it can cause a heart attack. This is a medical emergency.