Congestive heart failure is a long term progressive medical condition that affects the function of your heart muscles. In this condition, fluid builds up in the heart, further causing it to pump inefficiently.
Having heart failure can be life-threatening. This decrease in cardiac output, the amount of blood that the heart pumps, is not adequate to circulate the blood returning to the heart from the body and lungs, causing fluid to leak from capillary blood vessels. This leads to the symptoms that may include shortness of breath, weakness, and swelling.