Changes

===Location===

===Location===

*Nasal cavity - rhinitis

*Nasal cavity - rhinitis

===Type===

===Type===

Grossly many inflammatory processes (eg: response to viral or bacterial infection) in the URT will begin as a serous discharge, and then progress to a catarrhal exudate, and then to purulent/pseudomembranous/haemorrhagic as neutrophils are recruited

Grossly many inflammatory processes (eg: response to viral or bacterial infection) in the URT will begin as a serous discharge, and then progress to a catarrhal exudate, and then to purulent/pseudomembranous/haemorrhagic as [[Neutrophils|neutrophils]] are recruited

*Serous - transparent fluid exudate (acute inflammation)  

*Serous - transparent fluid exudate (acute inflammation)  

===Causes===

===Causes===

*Infectious agent

*Infectious agent

**[[Respiratory Viral Infections - Pathology|Viral]]

**[[:Category:Respiratory Viral Infections|Viral]]

**[[Respiratory Bacterial Infections - Pathology|Bacterial]]

**[[Respiratory Bacterial Infections - Pathology|Bacterial]]

**[[Respiratory Fungal Infections - Pathology|Fungal]]

**[[Respiratory Fungal Infections - Pathology|Fungal]]

*Irritants or allergens

*Irritants or allergens

*Neoplasia

*Neoplasia