What are the causes of allergic rhinitis??

An allergen is a typically harmless substance that causes an allergic reaction. Allergic rhinitis, commonly known as hay fever, is an allergic response to specific allergens. Some typical allergens are grass, dust, and mold. Pollen is the most common allergen. Your body releases histamine when it encounters an allergen. A histamine is a natural chemical that defends your body from the allergen. This chemical causes allergic rhinitis, which can have many uncomfortable symptoms such as a runny nose, sneezing, and itchy eyes. Common causes of allergic rhinitis include: pollen dust animal dander (old skin) cat saliva mold Pollen is the biggest culprit, especially during certain times of the year. Tree and flower pollens are more prevalent in the spring, while grasses and weeds produce more pollen in the summer and fall months.