Why Do People Breathe Through Their Mouths?

Some individuals may develop incorrect breathing habits over time, perhaps due to environmental or behavioral factors. This can lead to a preference for mouth breathing over nasal breathing. In reality, nasal breathing is always preferable and natural, offering numerous advantages such as better air filtration, humidification, and warming of inspired air, as well as support for the immune function of the respiratory system. However, there can be circumstances or conditions that lead people to breathe through their mouths. Here are some of the most common reasons:

One of the primary reasons people may breathe through their mouths is nasal obstruction. Nasal congestion can result from colds, allergies, sinus infections, or other respiratory conditions. When the nasal passages are blocked, breathing through the nose can become difficult or uncomfortable, prompting individuals to opt for mouth breathing to achieve easier airflow.

Secondly, mouth breathing is typical among those with anatomical issues, such as a deviated septum. A deviated septum is an anatomical problem where the septum, the wall that separates the two nostrils, is tilted or displaced from a central position. This can narrow the passage of air through the nose, leading some individuals to prefer mouth breathing to avoid respiratory difficulties.

Anxiety or stress can also contribute to mouth breathing. Situations of anxiety or stress may lead some people to breathe more shallowly and through the mouth, rather than taking deep breaths through the nose. Similarly, intense physical exercise stimulates faster breathing through the mouth. Especially during intense aerobic activities, some individuals may start to breathe through the mouth to achieve a greater airflow and meet the body's oxygen demands more efficiently. This is not a concern as long as it remains temporary.

Lastly, this type of breathing is common during sleep for individuals with obstructive issues (deviated septum, nasal congestion) and can give rise to typical nighttime snoring. Unfortunately, it can significantly disrupt nighttime rest. Breathing through the nose during sleep is important to prevent the onset of obstructive sleep apnea, a condition where the airways temporarily close during sleep. Proper nasal breathing helps keep the airways open and reduces the risk of respiratory interruptions.

It may be helpful to analyze breathing patterns during various daily activities, such as resting, exercising, or sleeping. Recognizing if you are breathing through your mouth is relatively simple and can be done with some awareness and attention. If you suspect that mouth breathing is causing discomfort or health issues, it is advisable to consult a doctor or an ear, nose, and throat specialist to assess the situation and receive appropriate advice.