See an allergist: Viral infections only last 7 to 10 days, so this is most likely due to allergy, chronic sinusitis, or a few other things. The best way to find out is to see an allergist; if the rest of your symptoms are consistent with allergy, you can be tested at that time for allergies, or the allergist can narrow down what to do next to figure this out.
Answered 3/26/2013
6.2k views
Could be allergies: Scratchy throat with persistent nasal congestion can be signs of allergic rhinitis. Physical exam and consultation with an allergist may help determine allergic triggers and treatment options.
Answered 6/11/2015
6k views
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