Health encyclopaedia - Alphabetical Topic List
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Causes of Sinusitis
There are a number of conditions that can cause the tissues inside the nose to swell and normal mucus to thicken, preventing proper sinus drainage and leading to sinusitis.
Bacterial infection is the most common cause of sinusitis and often follows a cold or flu-like illness.
Other causes include:
- allergies,
- nasal abnormalities,
- irritants – such as air pollution or chemicals,
- dental problems (such as having a tooth removed or a root infection) and
- smoking.
