(HealthDay News) -- 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.