Allergen exposure: 1) Inhalation: such as dust, pollen, fungi, animal fur, chemical powder, etc. 2) Ingestion: many foods can cause allergies, such as fish and shrimp, milk, eggs, etc.; drugs such as salicylic acid, sulfonamides and antibiotics, etc. 3) Contact: such as paint, fur, ammonia, cosmetics, etc. 4) Injection: such as serum, penicillin, streptomycin, etc. 5) Bacteria and toxins .
Allergic constitution: Because allergic rhinitis often coexists or alternates with other allergic diseases such as bronchial asthma and urticaria, and patients mostly have family history, so it may be related to heredity.
External factors: such as hot and cold changes, temperature changes, sunlight or ultraviolet stimulation, etc. Such external factors are a type of strong stimulus that can trigger the onset of rhinitis symptoms.
Intrinsic factors: endocrine disorders and other factors can constitute the onset of allergic rhinitis.