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17 Oct 06

Sinusitis, NIAID Fact Sheet

www.niaid.nih.gov/...sinusitis.htm - Preview

Fungi, such as Aspergillus
bacteria, such as Streptococcus pneumoniae and
Haemophilus influenzae
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- When this swelling involves the adjacent mucous membranes of your sinuses, air
  and mucus are trapped behind the narrowed openings of the sinuses. When your
  sinus openings become too narrow, mucus cannot drain properly. This increase in
  mucus sets up prime conditions for bacteria to multiply.
- For
  example, your nose reacts to an invasion by viruses that cause infections such
  as the common cold or flu by producing mucus and sending white blood cells to
  the lining of the nose, which congest and swell the nasal passages
- Similarly, when air is prevented from entering
  a paranasal sinus by a swollen membrane at the opening, a vacuum can be created
  that also causes pain.
- Therefore, anything that causes a swelling in the nose—an infection, an
  allergic reaction, or another type of immune reaction—also can affect the
  sinuses. Air trapped within a blocked sinus, along with pus or other
  secretions, may cause pressure on the sinus wall.

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