There are three types of sinusitis:
- Acute sinusitis is when symptoms are present for 4 weeks or less. It is caused by viruses or bacteria growing in the sinuses.
- Chronic sinusitis is when the symptoms and swelling of the sinuses is present for longer than 3 months. ...
- Subacute sinusitis is when the symptoms and swelling is present from 1 to 3 months.
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