Heart failure, also known as congestive heart failure, is a chronic condition where the heart doesn't pump blood as well as it should. It can result from functional or structural abnormalities of the heart. This condition leads to insufficient supply of blood to meet the body's needs, causing fatigue and shortness of breath.

Over time, the heart's ability to pump blood weakens, leading to fluid buildup in the lungs and other body tissues. This can result in severe complications if not managed properly. Monitoring and ongoing care are crucial aspects of managing heart failure.