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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 occurs when your nostrils widen while breathing, and may be a sign that you're having difficulty breathing. It's most commonly seen in children and infants. In some cases, it can indicate respiratory distress.