The sinuses are hollow, air-filled spaces in the skull and specifically the bones surrounding the nose (behind the forehead, nasal bones,cheeks, and eyes). Healthy sinuses contain no bacteria or other germs. Usually,mucus is able to drain out and air is able to circulate.
Sinusitis or Rhinosinusitis is inflammation in one or more of the paranasal sinuses. Inflammation typically occurs when the mucous membranes that line the nose and sinuses become irritated by a cold,allergy, pollution, or disease causing organisms. The irritation stimulates the mucous glands to secrete more mucus than usual to dilute and trap the exogenous matter, but at the same time, the irritation also slows the natural cleaning mechanism that would sweep the mucous out. Mucous therefore gets backed up and trapped in the sinuses, blocking the openings and therefore creating an environment where they can easily become infected. Sinusitis has been increasing steadily over the last decade...See Full Article