Sinus Infections

Healthy, non infected sinuses are filled with air. However, if the sinuses become blocked and filled with fluid, they can become infected, which is a condition known as sinusitis. This infection is very common; about 35 million people in the United States have it at least once a year.

Acute sinusitis usually starts suddenly and lasts for 2-4 weeks. Subacute sinus inflammation can last 4-12 weeks. Chronic inflammation last for more than 12 weeks. Recurrent sinusitis occurs several times a year .

Causes of sinusitis include:

  • the common cold
  • blocked drainage ducts
  • structural differences narrowing those ducts
  • nasal polyps
  • immune system deficiencies (could be caused by medications)