Rhinitis is nasal inflammation. There are two basic categories: infective rhinitis and non-infective rhinitis.
The nose may be infected by viruses or bacteria. The commonest form of rhinitis is also the commonest infectious disease of humankind, namely the common cold (otherwise known to medicine as coryza or viral upperrespiratory infection). There will be few readers who have not experienced a head cold at some point in their lives, and the description simply serves to stress the characteristics of rhinitis of any kind.