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The sinuses are air-filled spaces in the skull (behind the forehead, nasal bones, cheeks, and eyes) that are lined with mucus membranes. Healthy sinuses contain no bacteria or other germs. Usually, mucus is able to drain out and air is able to circulate.
When the sinus openings become blocked or too much mucus builds up, bacteria and other germs can grow more easily, and results in infection.
In many cases, the initial infection, persists at a low level, resulting in chronic sinusitis, which interferes with drainage and causes mucus to build up, ultimately causing blockage, and resulting in blocked nose, throbbing facial pain or a headache. Presence of allergies tend to worsen the condition.
Treatment of the condition usually depends on the severity of the symptoms. In most cases, OTC NSAIDs, like Advil, motrin or tylenol ; Antihistamines (benadryl); inhaled corticosteroids and antibiotics might be helpful to control the symptoms.
The definitive treatment of the condition is with a procedure called FESS (functional endoscopic sinus surgery), which removes the diseased tissues and helps in re-establishing the patency of the sinuses.
Since the CT has already confirmed the presence of chronic sinusitis, you might consult with your doctor, and seek proper advice and treatment.