Allergy

It is also called as Hypersensitivity. An allergy is a reaction of your immune system to something that does not trouble most other people. People who have allergies repeatedly are aware to more than one thing.

Substances that repeatedly cause reactions are

* Mold spores

* Pet dander

* Food

* Insect stings

* Pollen

* Dust mites

* Medicines

Allergies can cause a swelling, runny nose, sneezing, itching, rashes or asthma. Symptoms vary. Although allergies can make you feel bad, they generally won't kill you. But, a cruel reaction called anaphylaxis is life ominous.