Acute sinusitis sinus infection Viruses, bacteria, or fungi infect the sinus cavity, causing inflammation. More mucus nasal congestion discomfort in the cheeks, forehead, or around the eyes and headaches are common symptoms. They can happen due to inflammation from asthma .The bones of the face around the nose contain hollow spaces called paranasal sinuses. Inside the nose is the nasal cavity, which is divided into two passages by the nasal septum. The nasal septum is composed of both bone and cartilage and extends from the nostrils to the back of the nose.. Like the nasal cavity, the sinuses are all lined with mucus. The mucus secretions produced in the sinuses are continually being swept into the nose by the hair like structures called cilia on the surface of the respiratory membrane. This causes pus and mucus to accumulate in the sinus..The nasal cavity is a large air filled space above and behind the nose in the middle of the face. The nasal septum divides the cavity into two fossae. Each fossa is .
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