Tonsils can enlarge due to chronic mouth breathing. When a person breathes through their mouth, particularly during sleep, the air flow can cause the tonsils to become irritated and swollen.
Chronic mouth breathing can also lead to dehydration of the nasal passages, which can cause the tonsils to enlarge in an attempt to humidify and filter the air entering the lungs. Over time, this repeated irritation and swelling can cause the tonsils to become persistently enlarged, leading to a narrowing of the airway and potentially causing sleep apnea, a common sleep disorder where breathing is disrupted during sleep.
