This is such a horrid condition.
In my experience, it is normally down to an allergy of some kind, or to the body not being able to fight off a fungal or bacterial infection.
I have written a more complex factsheet for Sinusitis, which you can download for free here.
I hope it helps.
Click here for more info on what's in it ...
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The information given is not meant to be a substitute for seeing a health professional. It is our opinion only, based on several years of natural medicine practice and research. We're sure you'll find it useful, but please use it wisely and always exercise common sense.