The best known symptom is shortness of breath. Heart failure may result from excess fluid in the lungs, making it difficult to breath. Being tired is often another common symptom. As the heart works harder to pump properly, your muscles and other tissues receive less oxygen and nutrition. Without proper fuel, the body cannot perform as usual, and is tired. Swelling of the feet, ankles, legs and occasionally, the abdomen are other symptoms of Congestive Heart Failure. Many times, this is accompanied with sudden weight gain.