Dyspnea is a subjective experience of difficulty or discomfort in breathing. It is sometimes referred to as shortness of breath or breathlessness. It is a symptom, not a particular medical ailment, and it can be brought on by a number of underlying disorders that damage the body's circulatory, respiratory, or other systems.
People who experience dyspnea may describe feeling as though they are not getting enough oxygen, that their chest feels constricted,...