Causes



Heart failure is caused by many conditions that damage the heart muscle, including:
 

Coronary artery disease

Coronary artery disease (CAD), a disease of the arteries that supply blood and oxygen to the heart, causes decreased blood flow to the heart muscle. If the arteries become blocked or severely narrowed, the heart becomes starved for oxygen and nutrients.

 

Heart attack

A heart attack occurs when a coronary artery becomes suddenly blocked, stopping the flow of blood to the heart muscle and damaging it. All or part of the heart muscle becomes cut off from its supply of oxygen. A heart attack damages the heart muscle, resulting in a scarred area that does not function properly.
 

Cardiomyopathy

Damage to the heart muscle from causes other than artery or blood flow problems, such as from infections or alcohol or drug abuse. 

 

Conditions that overwork the heart

Conditions including high blood pressure, valve disease, thyroid disease, kidney disease, diabetes, or heart defects present at birth can all cause heart failure. In addition, heart failure can occur when several diseases or conditions are present at once.