Through prospective exploration of the efficacy of intranasal corticosteroids (INCS) combined with intranasal antihistamines (INAH) and INCS combined with oral antihistamines (OAH) in treating moderate to severe allergic rhinitis symptoms, this study aims to provide evidence-based medical evidence for the standardized treatment of patients with moderate to severe allergic rhinitis accompanied by typical nasal and ocular symptoms.

Inclusion Criteria:

1. Age range: 12-75 years old, both male and female are welcome;
2. The diagnostic criteria for moderate to severe allergic rhinitis refer to the "Chinese Guidelines for Diagnosis and Treatment of Allergic Rhinitis (2022, revised edition)", which states: (1) Symptoms: the presence of 2 or more symptoms such as paroxysmal sneezing, watery nasal discharge, nasal itching, and nasal congestion, with symptoms lasting or accumulating for more than 1 hour per day, with symptoms appearing for at least 1 year, a single symptom score (TNSS score standard) of 2 points or more, and a total nasal symptom score (TNSS score standard) of 6 points or more. May be accompanied by eye symptoms, including itching, tearing, redness, and burning sensation. (2) Signs: Pale and edematous nasal mucosa, accompanied by watery nasal secretions (3) Allergen testing: at least one allergen SPT and/or serum specific IgE positive, or nasal provocation test positive. (4) Severe or severe symptoms that have a significant impact on quality of life, including (i) sleep disorders, (ii) disruptions to daily activities, leisure, and/or exercise, (iii) disruptions to learning or work, (iv) anxiety, depression, or restlessness;
3. The enrolled patients reside in Northeast China and meet the follow-up requirements, including Hulunbuir City, Xing'an League, Tongliao City, Chifeng City, and Xilingol League in Heilongjiang Province, Jilin Province, Liaoning Province, and Inner Mongolia Autonomous Region;
4. The subjects voluntarily participated in this study and signed a written informed consent form.

Exclusion Criteria:

1. Patients who are allergic to other excipients such as azelastine hydrochloride, fluticasone propionate, or related drugs;
2. Pregnant women;
3. Patients with arrhythmia, severe organic heart disease, glaucoma, prostate enlargement, active tuberculosis, malignant tumors, systemic immune diseases, or uncontrolled active infections, such as acute upper respiratory tract infections, who cannot be treated with relevant drugs;
4. Other patients who are unwilling to cooperate with treatment or unable to cooperate with follow-up due to serious systemic or mental illnesses;
5. There are certain organic diseases of the nasal cavity, such as benign and malignant tumors of the nasal cavity, chronic sinusitis with nasal polyps, etc;
6. Age<12 years old or>75 years old;
7. Patients who have received allergen specific immunotherapy or biologic therapy within the past 6 months;
8. Those who cannot tolerate serious systemic or local adverse reactions during relevant examinations or specimen collection;
9. Researchers believe that patients who cannot be included in the group.