Heart failure can get worse if it's not treated. It's very important to do what your doctor tells you to do. Heart does not pump enough blood. Blood backs up in veins. Fluid builds up, causing swelling in feet, ankles and legs.
Body holds too much fluid.
Body does not get enough blood, food and oxygen. Clogged arteries don't allow enough blood to flow to the heart. Past heart attack has done some damage to the heart muscle. Heart defects present since birth. High blood pressure.