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Sinusitis refers to inflamed sinuses normally caused by a bacterial, fungal or viral infection, the U.S. National Library of Medicine says.

The agency says these common warning signs may indicate sinusitis:
-Cold symptoms that persist for more than five to seven days.
-Inability to smell, drainage into the back of the throat, or a sore throat.
-Headache and pressure or tenderness in the face — surrounding the eyes and sometimes affecting the teeth.
-Nasal congestion, bad breath or runny nose.
-Coughing, particularly at night.
-Fever, fatigue and general feeling of illness.

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