Congestive Heart Failure is a condition in which the heart can't pump blood the way it should. In some cases, the heart can't fill with enough blood. In other cases, the heart can't send blood to the rest of the body with enough force. Some people have both problems. "Heart failure" doesn't mean that your heart has stopped or is about to stop working. However, it's a serious condition that requires medical care. Heart failure develops over time as the pumping of the heart grows weaker. It can affect the right side of the heart only or both the left and right sides of the heart. Most cases involve both sides of the heart.