Sinusitis: What Is, Causes, Symptoms, Diagnosis, and Treatment

Updated on February 21, 2025

What Is Sinusitis?

Sinusitis is inflammation of the mucous tissues lining the air-filled spaces called the paranasal sinuses. The sinuses are complicated, divided airways and drainage pathways situated at the area of the nose and belong to an area known as the upper respiratory tract. Humans possess four paranasal sinuses: the maxillary, frontal, ethmoid, and sphenoid. A thin layer covering the...

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