The symptoms depend on the severity level and type of heart failure. Shortness of breath while going up the stairs or even at rest is typical. Retentions of water (edemas) in the legs, at the back of the foot or in the lungs very often occur. You will notice this when suddenly your usual shoes no longer fit. Since the water retentions flow back out of the tissue and are excreted during the night, frequent night urination is a further symptom of heart failure.
When reclining with the upper body raised, patients feel that it is easier to breath, since water retention in the lung are reduced. Cardiac arrhythmias are also symptoms of heart failure, as well as decreased capacity, lack of appetite and fatigue.