Both heart attack and heart failure are serious medical conditions that can cause death.Heart attack is caused by sudden total clogging of an artery that gives blood to the heart muscle. This kills part of the muscle of the heart, which weakens the heart.
Heart failure occurs when the heart cannot circulate blood through the body. In some kinds of heart failure, the heart is weak and cannot push blood to the parts of the body that need blood. In other kinds of heart failure, blood cannot get through the heart and it backs up into the lungs, causing fluid in the lungs.