ABSTRACT
Rhinitis is a very common and well-known disorder. Chronic rhinitis affects up to 20% of the general population (1) and can be due to common factors such as allergy or smoking, or less common factors such as xylometazoline abuse or cystic fibrosis. Rhinitis means inflammation of the nasal mucosal membrane. However, markers of inflammation are not examined in routine clinical work. The term ‘‘rhinitis’’ is therefore used in daily practice for nasal dysfunction causing symptoms like nasal itching, sneezing, rhinorrhea, and/or nasal blockage (1).
