Upper respiratory infection, influenza
Sinusitis
Juvenile nasopharyngeal angiofibroma
Nasal polyp
Nasal mass<unk> 
CSF leak (e.g. basilar skull fracture)
Toxic inhalation (e.g. selenium toxicity, neurotoxic shellfish poisoning)
Nasal foreign body
Upper respiratory infection, influenza
Nasal polyp
Sinusitis
Ear foreign body
Juvenile nasopharyngeal angiofibroma
Nasal septal hematoma
Nasal fracture