- Sinus infections are caused by infections from a pathogenic microorganism (virus, bacterium, or fungus), which grows within a sinus and causes intermittent blockage of the sinus ostiu
- .Symptoms of sinusitis include:
- a green or yellow discharge from your nose
- a blocked nose
- pain and tenderness around your cheeks, eyes or forehead
- a sinus headache
- a high temperature (fever) of 38C (100.4F) or more
- toothache
- a reduced sense of smell
