All that Wheezes is not Asthma or Bronchiolitis.

Wheezing is a common finding across patients of all age groups presenting to the emergency department and being hospitalized for respiratory distress, with most patients responding to standard therapeutics and having readily apparent diagnoses of asthma or bronchiolitis. We describe several clinical entities that may present with wheezing and respiratory distress, calling attention to the broad differential that may masquerade as asthma or bronchiolitis, and potentially lead to misdiagnosis, delayed diagnosis, or inappropriate treatment.