Overview Shortness of breath (dyspnea) is most commonly caused by heart or lung conditions. Other causes include anemia, anxiety, lack of exercise or living with obesity. What is dyspnea (shortness of breath)? Dyspnea (pronounced "DISP-nee-uh") is the word healthcare providers use for feeling short of breath. You might describe it as not being able to get enough air ("air hunger"), chest tightness or working harder to breathe. Shortness of breath is often a symptom of heart and lung problems. But it can also be a sign of other conditions like asthma, allergies or anxiety. Intense exercise or having a cold can also make you feel breathless. What are paroxysmal nocturnal dyspnea (PND) and sighing dyspnea? Paroxysmal nocturnal dyspnea (PND) is a feeling like you can't breathe an hour or two after falling asleep. Sighing dyspnea is when you sigh a lot after taking deep breaths in to try to relieve the feeling of dyspnea. What is the differ...
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