Sinusitis . Medically known as rhinosinusitis, a  sinus infection  occurs when your nasal cavities become  infected , swollen, and inflamed.  Sinusitis  is usually caused by a virus and often persists even after other upper respiratory symptoms are gone. In some cases, bacteria, or rarely fungus, may cause a  sinus infection .     Sinusitis     Medically known as rhinosinusitis, a sinus infection occurs when your nasal cavities become infected, swollen, and inflamed.   Sinusitis is usually caused by a virus and often persists even after other upper  respiratory symptoms  are gone. In some cases, bacteria, or rarely fungus, may cause a sinus infection. Other conditions such as  allergies ,  nasal polyps , and  tooth infections  can also contribute to sinus pain and symptoms..    TYPES   Chronic vs. acute     Acute sinusitis  only lasts for a short time, defined by the American Academy of Otolaryngology as less than four wee...
 
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