1. Allergic rhinitis : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen or dust, the body releases chemicals, including histamine. This causes allergy symptoms such as itching, swelling, and m...• Reviewer: Stuart I. Henochowicz, MD, FACP, Associate Clinical Professor of Medicine, Division of Allergy, Immunology, and Rheumatology, Georgetown University Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

2. Allergic Rhinitis : Causes  (Trust Mark: Doctor-Reviewed)
Allergic rhinitis is a type of immune reaction. Normally, the immune system responds to foreign microorganisms, or particles like pollen or dust, by producing specific proteins, called antibodies. Antibodies are capable of binding to identifying m...• Author: Christine Kuehn Kelly