The Definition of Heart Disease

Heart disease is any condition that causes your heart to malfunction. When the words "heart disease" are used generically, what people are usually referring to is Coronary Heart Disease which leads to heart attacks and angina, ultimately caused by Atherosclerosis. But there are a wide range of other diseases of the heart. For example:
1) Congestive Heart Failure
2) Valvular Heart Disease - Diseases of the heart valves
3) Cardiac Arrhythmias - Irregular heartbeats
4) Diseases of the Pericardium
5) Diseases of the Myocardium
6) Congenital Heart Disease - birth defects of the heart
7) Endocarditis (infection of a heart valve)