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Sinuses are air-filled cavities within the skull bone. These hollow spaces in the skull are situated in cheek bones, forehead, behind the bridge of the nose and between the eyes. Another set is situated in the upper region of the nose and behind the eyes. All the sinuses have the same lining that is present in the nose. This lining produces mucus, which is drained out of the sinuses through an opening in the nose. When a person has cold or an allergy, swelling in the nose and sinuses can cause the drainage to get blocked. This results in the mucus being trapped in the sinuses, leading to the growth of bacteria and viruses; the inflammation of these sinuses is known as sinusitis.
Causes of Sinusitis