Depending on the individual and specific allergen triggers, the duration of allergic rhinitis symptoms can vary. Seasonal allergic rhinitis, caused by pollen from trees, grasses, and weeds, typically lasts for several weeks during the pollen season. Perennial allergic rhinitis, triggered by indoor allergens like dust mites, pet dander, and mold, can cause symptoms year-round. However, with proper management and avoidance of allergen triggers, the severity and duration of symptoms can be reduced.