Several: Bad teeth hygiene, chronic sinusitis, acid reflux.. To name a few..
Answered 2/5/2013
5.3k views
Many things: The contents of your stomach coming back up ("reflux"), poor drainage from your sinuses or the tubes to your middle ear, poor teeth cleaning, etc. Speak with your doctor to determine what is the most likely cause.
Answered 2/5/2013
5.3k views
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