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Nasal flaring is when the nostrils widen while a person is breathing. It is a sign that the person is having difficulty breathing. It is most commonly seen in children and infants; in those cases nasal flaring can indicate respiratory distress.
Intercostal recession is when the muscles between the ribs are sharply pulled inward. This is a consequence of a partial blockage of the airways, which causes a pressure drop in the area where these muscles exist.