Jeela Harun Al Rashid posted a photo on Extra Cash's wall: What is SINUSITIS? Sinusitis is the result of an inflammation or infection to one or more of the para-nasal sinus cavities. These are small, air-filled cavities of bone located in the skull and are positioned around the nose, above and behind the eyes. Studies have shown that 39 million Americans suffer with sinusitis yearly; it has become one of the most common health conditions affecting Americans. 1. What is Sinusitis and how does it affect the four sinus cavities? 2. What are the Caus...