This condition can present at any age with a variety of symptoms. Initial diagnosis is clinical. Each patient's case must be investigated and treated appropriately, and there is often a delay before patients receive treatment. 

The diagnostic criteria for chronic rhinosinusitis according to the American Academy of Otolaryngology is as follows:[15]

Twelve weeks or longer of two or more of the following signs and symptoms:

  • Mucopurulent drainage (anterior, posterior, or both)

  • Nasal obstruction (congestion)

  • Facial pain/pressure/fullness

  • Decreased sense of smell.

Inflammation is documented by one or more of the following findings:

  • Purulent (not clear) mucus or oedema in the middle meatus or anterior ethmoid region

  • Polyps in nasal cavity or the middle meatus, and/or

  • Radiographic imaging showing inflammation of the paranasal sinuses. 

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