Obstructive sleep apnea: Blocked upper airway

Obstructive sleep apnea: Blocked upper airway

Normal airway, showing air flowing through open airway, compared to obstructive sleep apnea, showing air flow blocked by tongue in narrowed airway.

Blocked or narrowed airways in your nose, mouth, or throat can cause sleep apnea. Your airway can become narrowed when your throat muscles and tongue relax during sleep.

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