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yawning
A reflex of simultaneous inhalation of air and stretching of the eardrums, followed by inhalation of breath. Etiology: - drowsiness - weariness - stress - boredom - disorders associated with excessive daytime sleepiness - vasovagal reaction - myocardial infarction - aortic dissection - opiate withdrawalGeneral
sign/symptomReferences
- Yawning - excessive MedlinePlus http://www.nlm.nih.gov/medlineplus/ency/article/003096.htm
- Wikipedia: Yawn http://en.wikipedia.org/wiki/Yawn