No standard definition exists for difficulty breathing. For some, a sense of breathlessness may occur with only mild exercise (for example, climbing stairs) without indicating the presence of a specific disorder. Others may have advanced lung disease and difficulty exchanging air but may never feel a sensation of shortness of breath.
In some circumstances, a small degree of breathing difficulty may be normal. Severe nasal congestion is one example. Strenuous exercise, especially when a person does not exercise regularly, is another. In many situations, however, difficulty breathing represents the presence of significant disease and should be evaluated by a health care provider immediately.
Wheezing is one form of breathing difficulty. See also rapid breathing, apnea, and other lung diseases.
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