It is possible that the symptom you reported (swelling tongue) might be related to an allergy and, in this case, might be life threatening. An allergy to certain substances (most likely food) might cause an allergic reaction that affects the tissue they come in contact with. When it happens the tongue swells within minutes and if it swells too much it might close the airway which is a very serious condition. Visiting an emergency service is highly recommended.
If the swelling is not so severe and it lasts longer, then it might be caused by dry air. It is not uncommon, for the tongue and especially the rear part of the palate to swell when the air is very dry.
The throat and palate mucosa tend to dry themselves in order to provide enough moisture for the air that is inhaled. This might cause inflammation in the affected tissue associated with swelling. The swelling might be transitory and the condition is improved once the person enters an area with sufficient moisture in the air. You might want to visit an Ear, Nose and Throat specialist for a physical examination in order to check for other more serious conditions.
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