Sinusitis is the inflammation of the mucous membranes of the paranasal sinuses. However, sinusitis is almost always accompanied by inflammation of the contiguous nasal mucosa, hence a more accurate term rhinosinusitis has superseded the terms rhinitis and sinusitis (1,2)
It is one of the most common diagnoses in primary care. In the USA
Sinusitis is generally triggered by a viral upper respiratory tract infection, with only 2% of cases being complicated by bacterial sinusitis (1)
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