If you don't want to go to the doctor everytime you have sinus problems, how can you tell the difference between a virus and a bacterial infection.
The vast majority of sinus infections are caused by viruses.
A sinus infection is likely to be caused by bacteria rather than a virus if any of the three following conditions is present:
Symptoms last for at least 10 days without any evidence of improvement.
Symptoms are severe, including fever of 102°F or higher, and nasal discharge and facial pain lasting for at least three to four consecutive days at the beginning of illness.
Symptoms or signs worsen, as characterized by new fever or headache developing or nasal discharge increasing, typically after a viral upper respiratory infection that lasted five or six days and initially seemed to improve.
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