The exact cause of allergic rhinitis is not known, but genetic factorsare important. It says people with predisposition to allergicreactions that have an "atopic". In other words, it shows a greatreactivity to contact allergens, banal and harmless to most of thepopulation. They can give rise to different manifestations: allergicrhinitis, asthma, hives, eczema, food allergies, etc.., which canoccur isolated, simultaneously or sequentially, depending on theperson.
An allergy is an abnormal and excessive reaction of the immune system, whose role is to protect the body against pathogens(bacteria and viruses). Allergy symptoms are caused by immune response against a foreign substance (allergen).
Hay fever is an allergic reaction to pollen. A similar reaction occursin an allergy to mold, animal dander, dust and otherpneumalergeni. The amount of pollen in the air influencesymptoms. Hot and dry air generally contains a larger amount ofpollens than cold air and moist.
Risk Factors
- heredity plays a role in allergies, including allergic rhinitis. If oneparent suffers from an allergy, the risk to children is about 50% andif both parents are allergic, the risk of developing an allergy to thebaby reaches 80%.
- repeated exposure pneumalergeni
- Exposure to cigarette smoke, especially early in life, but also toother respiratory irritants
- abuse of topical decongestants (nasal sprays) can aggravatenasal mucosa, thus leading to the occurrence of rhinitis
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