What is Sinus Infection

Woman wincing in pain. Close-up of her sinuses and how bacteria in the mucus causes inflammation.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 allergiesnasal 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 weeks. An acute infection is usually part of a cold or other respiratory illnessChronic sinus infections last for more than twelve weeks or continue to recur. Specialists agree that the main criteria for sinusitis include facial pain, infected nasal discharge, and congestion.
Many sinus infection symptoms are common to both acute and chronic forms. Seeing your doctor is the best way to learn if you have an infection, to find the cause, and to get treatment. 

Pain in your sinuses


Pain is a common symptom of sinusitis. You have several different sinuses above and below your eyes as well as behind your nose. Any of these can hurt when you have a sinus infection.
Inflammation and swelling cause your sinuses to ache with a dull pressure. You may feel pain in your forehead, on either side of your nose, in your upper jaws and teeth, or between your eyes. 

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