What causes daytime mouth breathing in obstructive sleep apnea (OSA)?

Updated: Feb 13, 2019
  • Author: Mary E Cataletto, MD; Chief Editor: Denise Serebrisky, MD  more...
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Most children with obstructive sleep apnea have tonsillar hypertrophy, adenoid hypertrophy, or both. Parents frequently describe these children as mouth breathers, even during the day while they are awake.

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