Viral source is by far most common. Bacterial infection accounts for only 0.5-2% of all cases
Other causes include allergies and fungal infection
Timeframe
Acute (<4 weeks)
Subacute (4-12 weeks)
Chronic (>12 weeks)
Other causes include allergies and fungal infection
Acute (<4 weeks)
Subacute (4-12 weeks)
Chronic (>12 weeks)
Sinusitis
Upper respiratory infection, influenza
Laryngitis
Mastoiditis
Juvenile nasopharyngeal angiofibroma
Croup
Nasal polyp
Pharyngitis