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Commonly referred to as hay fever, allergic rhinitis is a reaction to airborne allergens, such as pollen, dust mites, pet dander, or mould. It inflames the nasal passageways, producing symptoms including sneezing, runny or clogged nose, itchy eyes, sore throat, and postnasal drip. These symptoms could be seasonal—triggered by pollen—or perennial—present year-round from indoor allergies. 
The disorder results from the immune system overreacting to benign allergens, releasing histamine and other molecules aggravating allergic reactions. Diagnosis is usually made based on a patient's history, physical examination, and occasionally allergy tests, such as blood tests or skin prick tests.
Treatments centre around allergy avoidance and symptom control. Common treatments consist of antihistamines, nasal corticosteroid sprays, decongestants, and saline nasal rinses. Immunotherapy—allergy shots or pills—may be advised in cases of ongoing or severe allergies.
During high pollen seasons, windows should be closed; air purifiers should be used; frequent cleaning helps to lower dust mite count; and recognised allergens should be avoided. Even in the height of allergy seasons, people with allergic rhinitis can have a comfortable and busy life with correct care.