If you've been experiencing these symptoms, there's a good chance that you actually have sinusitis, a condition characterized by an inflammation of the sinus cavities caused by viruses or bacteria. It is usually inconvenient and may be painful in some cases. But it is treatable and usually not severe. Sinus cavities are the moist and hollow air spaces within the bones of the face around the nose. Located in the area near the eyebrows are the frontal sinuses; the maxillary sinuses are located inside the cheekbones; the ethmoid sinuses are fixed between the eyes; while the sphenoid sinuses found behind the ethmoid sinuses.
Sinuses produce mucus, which drains into the nose. If your nose is swollen, this can block the sinuses and cause pain and infection. Under normal conditions, sinuses are filled with air which make facial bones appear to be less dense and much lighter in weight. Without these sinuses, the skull would be so much heavier that you would need both hands to hold your head up all throughout the day.
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