<unk>  is a term that refers to a heterogeneous group of nasal disorders characterized by the presence of one or more nasal symptoms such as sneezing, nasal itching, rhinorrhea(anterior and posterior), and nasal congestion. It is broadly classified into allergic and nonallergic<unk> , although some forms of<unk>  cannot be easily classified into these categories. Allergic<unk>  is a multifactorial disease, its development is influenced by an interplay of genetic and environmental factors. Aeroallergens in the nasal tissue undergo antigen processing, eliciting allergen-specific allergic responses and also promoting the development of allergic airway disease. Proteins and glycoproteins in indoor and outdoor inhalant allergens such as dust mite fecal particles, cockroach residues, animal danders, molds, and pollens are common aeroallergens causing allergic<unk> . Allergic<unk>  is usually an IgE mediated disease with varying degrees of nasal inflammation. Nonallergic<unk>  is a heterogenous group with poorly defined and understood pathophysiology, and it consists of a variety of conditions which require more research and phenotyping.
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Epiglottitis pathophysiology
Urticaria pathophysiology
Rhinitis risk factors
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Strep throat pathophysiology
Foot-and-mouth disease pathophysiology