We all know somebody who suffers from heart disease or who has died from it, including members of our own families. Heart disease is our modern plague. It has become a background noise for many of us, so we don't stop and think: what on earth is heart disease and should I be concerned about it? People may suffer from many different heart problems, such as rheumatic fever, congenital heart defects, infections, tumours, heart muscle disorders, injury, damage from drugs and other toxins, genetic disorders, and heart failure. However, when people talk about "heart disease", what they mean is Coronary Heart Disease (CHD). Why? Because it is the number one killer in the Western world.