Allergic rhinitis is a very common medical condition that affects between 20 and 40 million people in the United States. Although allergic rhinitis is not a life–threatening condition, complications can occur and can significantly affect quality of life. In children, allergic rhinitis has a prevalence of up to 40%, making it the most common chronic disease during childhood. It has been noted in the last 30 years that its frequency has been steadily increasing. Of the children who suffer from this condition, approximately 40% are diagnosed by age six.