Sinusitis. Abstract image of the face of a man suffering sinusitis, his inflamed sinuses highlighted in red. The sinuses seen are the frontal sinuses above the nose, and maxillary sinuses in the cheekbones. Sinuses are air-filled cavities lined with mucous membranes. Secretion of mucus by the sinus lining acts as a trap against microorganisms and foreign particles. Sinusitis is normally a bacterial infection of the membranes and is a complication of a viral infection such as a common cold. Symptoms include headache and pain and a discharge may be passed through the nose. Loss of smell may occur. Treatment is with anti- biotic drugs and decongestants.
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