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Your intercostal muscles attach to your ribs. When you breathe in air, they normally contract and move your ribs up. At the same time, your diaphragm, which is a thin muscle that separates your chest and abdomen, drops lower and your lungs fill wi...
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.