Changes

An '''allergy''' is a reaction of the [[immune system]]. The term allergy is also known as hypersensitivity.  People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are

An '''allergy''' is a reaction of the [[immune system]].<ref name="Epidemic">{{cite book|pages=40-44|title=The Allergy Epidemic|date=June 2015|issn=1176-8746|author=Anna Richards|publisher=Healthy Food Guide}}</ref> The term allergy is also known as [[hypersensitivity]].  People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are

* [[Pollen]]

* [[Pollen]]

* [[Dust mite]]s

* Dust mites

* [[Mold]] spores

* Mold spores

* Pet dander

* Pet dander

* [[Food]]

* [[Food]]<ref name="Epidemic" />

* [[Insect]] stings

* [[Insect]] stings

* [[Medicine]]s

* [[Medicine]]s

==Causes==

==Causes==

Scientists think both [[gene]]s and the environment have something to do with it. Normally, your immune system fights germs. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm.

[[Scientist]]s think both [[gene]]s and the [[environment]] have something to do with it. Normally, your immune system fights [[germ]]s. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm.

Some studies have shown a link between [[vaccination]]s and food allergies.<ref>http://barbfeick.com/vaccinations/allergy/951-vaccine_allergy.htm</ref> <ref>https://www.naturalnews.com/055457_vaccines_food_allergies_CDC_study.html</ref>   

Some studies have shown a link between [[vaccination]]s and food allergies.<ref>http://barbfeick.com/vaccinations/allergy/951-vaccine_allergy.htm</ref> <ref>https://www.naturalnews.com/055457_vaccines_food_allergies_CDC_study.html</ref>   

==Symptoms==

==Symptoms==

Allergies can cause a runny nose, sneezing, itching, rashes, swelling or asthma. Symptoms vary. Although allergies can make one feel bad, they are usually not fatal. However, a severe reaction called [[anaphylaxis]] is life-threatening.

Allergies can cause a runny nose, sneezing, itching, rashes, swelling or [[asthma]]. Symptoms vary. Although allergies can make one feel bad, they are usually not fatal. However, a severe reaction called [[anaphylaxis]] is life-threatening.

==References==

==References==