eMedicine: Allergic Rhinitis (Hayfever(Health/Respiratory_Disorders) emedicine.com Description: Dr. Javed Sheikh reports on pathophysiology of seasonal and perennial allergic rhinitis... or hayfever. Review common allergy symptoms, allergens, trigger factors, and drug treatments.Rhinitis, Allergic Rhinitis is defined as inflammation of the nasal membranes and is characterized by a symptom complex that consists of any combination of the following: sneezing, nasal congestion, nasal itching, and rhinorrhea. The eyes, ears, sinuses, and throat can also be involved. Allergic rhinitis is the most common cause of rhinitis. It is an extremely common condition, affecting approximately 20% of the population. While allergic rhinitis is not a lifethreatening condition, complications can occur and the condition can Specializes in: rhinitisallergicseasonal allergic rhinitisperennial allergic rhinitishayfeverallergiesseasonal allergiesnasal membrane inflammation...runny nosestuffy head