Sinus infection is an inflammation of the sinuses and nasal passages. Usually, it happens after an upper respiratory infection (URI), common cold or allergy that can block the opening of the paranasal sinuses. Sinusitis can cause a headache or pressure in the eyes, nose, cheek area, or on one side of the head. It also may couse a cough, a fever, bad breath, and nasal congestion with thick nasal secretions. Sinusitis is categorized as acute (sudden onset) or chronic (long term, the most common type).

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