Allergic rhinitis is caused by allergic inflammation in the nose and throat after being exposed to an allergen. Symptoms include runny nose (rhinorrhea), stuffy nose (nasal congestion), itching, and sneezing. Itchy or watery eyes can also be symptoms. For some patients, the symptoms are seasonal; for others, the symptoms are year round. Treatment often consists of trying to reduce exposure to the allergen and using medicines such as nasal steroids, oral antihistamines, or decongestants.