If we are not eating properly and not doing exercise regularly then we can feel very tired and weak and it leads us to heart failure. Being overworked or depressed can make a person tired or give them a general feeling of weakness and even lack of concentration is the sign of HF. There are a few physical signs that may indicate Heart Failure. Fluid retention, which causes weight gain and possible swelling of the feet, ankles, or even abdomen, is associated with the disease. Another physical sign is bulging of the neck veins. These all are sign of heart failure and now a days it happens most of the time.