Mouth breathing

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Name of Symptom/Sign:
**Mouth breathing**
*Classifications and external resources*
ICD-10	R06.5
ICD-9	784.9

Mouth breathing refers to the state of inhaling and exhaling through the mouth.

A healthy individual normally breathes through the nose while resting or doing light exercise, and breathes simultaneously through both the nose and mouth during vigorous aerobic exercise, in order to supply sufficient oxygen. Excessive mouth breathing is problematic because air is not filtered and warmed as much when inhaled through the nose, as it bypasses the nasal canal and paranasal sinuses, and dries out the mouth. Mouth breathing is often associated with congestion, obstruction, or other abnormalities of the upper respiratory tract. Comorbidities include asthma, obesity, snoring, halitosis, and obstructive sleep apnea.

Mouth breathing in public is sometimes considered to be less socially acceptable or attractive than nose breathing, as mouth breathers can appear to have a somewhat "slack jawed" look and can cause or exacerbate bad breath. Consequently, the term "mouth breather" may be used in a pejorative sense for someone lacking in hygiene or intelligence.