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{{RefAppeal}}
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]]. 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
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.
[[Category:Medicine]]
[[Category:Medicine]]