More questions:: Does it hurt? How bad is it, and how long has it been that way? The tongue could swell for a number of reasons including but not limited to injury to the tongue (biting or external injury), a local reaction to an irritant in your mouth, or an allergic (system-wide reaction). Determine which of these it could be (if any and consult with an oral surgeon, ENT or your pcp).
Answered 12/10/2017
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Tongue chewing: You may be chewing on your tongue. Thus can happen during sleep.
Answered 8/18/2016
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Biting: In many cases, tongue inflammation on the sides only is caused by biting on the tongue. To rule out any issues, it should be checked by your dentist.
Answered 2/25/2016
5.4k views
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