A runny nose is the more common name for rhinitis. It describes the inflammation and irritation of the internal areas of the nose. This can be due to virus, bacteria or irritants. The inflammation usually results in excessive amounts of mucous being produced.
Runny nose or rhinitis affects not just the nose but also the throat and the eyes. A runny nose triggered by pollens of seasoanl plants is called hay fever. Although it start out as seasonal allergy it can develop into an all year round affliction.
Seasonal - occurs during early spring
Perennial - occurs throughout the year