Rhinitis:

Rhinitis is an inflammation of the mucous membrane that lines 
the nose, often due to an allergy to pollen, dust or other 
airborne substances. Seasonal allergic rhinitis also is known 
as "hay fever," a disorder which causes sneezing, itching, a 
runny nose and nasal congestion. 

This is a clinical term for the following symptoms: nasal 
blockage (congestion), nasal discharge (runny nose), nasal 
itching and sneezing. The cause is typically infection (viral, 
mostly), allergy, structural, or the all-important 'other'. 
For more on rhinitis, read this fact sheet. Rhinitis often 
triggers flares in susceptible asthmatics, like my son for 
one. Ed has vasomotor rhinitis, which means he gets a runny 
nose for no explicable reason.