Coronary heart disease happens when your heart’s blood supply is blocked or interrupted by a build-up of fatty substances in the coronary arteries.
Over time this can build up and if your coronary arteries become narrow due to this build-up of fatty deposits, the blood supply to your heart will be restricted; this can cause angina (chest pains).
If a coronary artery becomes completely blocked, it can cause a heart attack.
By making some simple lifestyle changes, you can reduce your risk of getting CHD. If you already have heart disease, you can take steps to reduce your risk of developing further heart-related problems.
Coronary Heart Disease – NHS UK