Can you still snore with your mouth closed?

Snoring can still occur even with the mouth closed. Snoring is a symptom caused by various factors, most commonly due to obesity, incorrect sleeping posture, or nasal inflammation. The underlying cause should be identified and treated accordingly.

Snoring during sleep primarily occurs when airflow passes through the nasal cavity into the oropharynx, changing from laminar flow to turbulent flow. Therefore, snoring can also happen even when sleeping with the mouth closed. However, many people who snore tend to sleep with their mouths open. This is because, after air flows past the soft palate, the transition from laminar to turbulent airflow causes vibrations in the surrounding muscles, producing the snoring sound. When airflow resistance increases, many individuals naturally open their mouths to breathe, making snoring more apparent. Nevertheless, even with a closed mouth, if the pattern of airflow induces muscle vibration, snoring can still occur.

In general, breathing with the mouth closed suggests sufficient airflow and an unobstructed airway, making snoring less likely. When snoring does occur, it often involves slight or full mouth opening, which makes the snoring more pronounced.