The heart has its own "electrical" and "plumbing" systems. The electrical system is how the heart beats and is controlled by heart cells that create an electrical pathway. The plumbing system concerns the blood vessels and the blood flowing through them.
Heart disease refers to heart and blood vessel conditions. These conditions include coronary artery disease, heart valve disease, abnormal heart rhythms (arrhythmias), heart conditions present at birth (congenital heart disease), congestive heart failure and other heart conditions. Heart disease can cause heart attacks, strokes and other complications.
Heart disease can often be treated if found early. You may prevent or improve heart disease if you exercise, eat a healthy diet, quit smoking, lower your blood pressure and cholesterol levels, and maintain a healthy weight.