When does allergic rhinitis occur? (Select all that apply.)
a. Nasal mucosa become inflamed.
b. Exposure as a result of an allergen produces inflammation.
c. Histamine is released following allergen exposure.
d. The weather is cold during the winter.
e. A person has an initial exposure to an antigen.
ANS: A, B, C
Allergic rhinitis is inflammation resulting from an allergic reaction. Following allergen exposure, and with subsequent inhalation of the allergen, an antigen-antibody reaction occurs, causing inflammation and swelling of the nasal passages. Histamine is released during the allergic reaction. Allergic rhinitis can occur during any season, depending on when the allergen is most abundant in the air. Allergic rhinitis occurs in patients who have experienced previous exposure to one or more allergens and have developed antibodies.
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