Heart diseases are the disorders that affect the heart. Diseases under the heart diseases umbrella include blood vessel diseases, such as coronary artery disease, heart rhythm problems (arrhythmias), and heart defects i.e. congenital heart defects, Rheumatic heart disease, Hypertensive heart disease, Ischemic heart disease, Hypertension etc. Heart failure is a condition in which the heart can't pump enough blood to meet the body's needs.