DefinitionBreathing difficulty involves a sensation of difficult or uncomfortable breathing or a feeling of not getting enough air.See also: Difficulty breathing - first aidAlternative NamesShortness of breath; Breathlessness; Difficulty breathing; DyspneaConsiderationsNo standard definition exists for difficulty breathing. Some people may feel breathless with only mild exercise (for example, climbing stairs), even though they do not have a specific disorder. Others may have advanced lung disease but never feel short of breath.Wheezing is one form of breathing difficulty.See also:ApneaLung diseasesRapid breathingCommon CausesShortness of breath has many different causes.A blockage of the air passages in your nose, mouth, or throat may lead to difficulty breathing.Heart disease can cause br