Rhinitis, Allergic, Perennial

**Definition:** Inflammation of the mucous membrane of the nose similar to that found in hay fever except that symptoms persist throughout the year. The causes are usually air-borne allergens, particularly dusts, feathers, molds, animal fur, etc.

**Tree numbers:** - C08.460.799.315.500 - C08.674.453.500 - C09.603.799.315.500 - C20.543.480.680.443.500

**Synonyms:** - Rhinitis, Allergic, Nonseasonal