Allergy vs irritant
is an allergic response to pollen
, molds, & pet dander; this requires sensitization (prior exposure) and subsequent production of allergic antibodies (called ige).
Vasomotor rhinitis is due to irritation; 'vaso' means blood vessel while 'motor' implies something causes the vessels to react, typically irritants like smoke & dust. Skin testing is negative with vasomotor rhinitis.