Rhinitis is defined as inflammation of the inner lining of the
nose. Allergic rhinitis occurs as a result of an inflammatory
response to tiny airborne particles called allergens. The allergic
reaction results in activation of two types of inflammatory cells;
mast cells and basophils. These cells produce inflammatory
substances, such as histamine and leukotrienes, which cause
fluid build-up in the nasal cavity, irritation, sneezing and a
runny nose.
Seasonal allergic rhinitis versus perennial allergic