Hi Every one.  I hope every one knows what is an allergy.  An Allergy is a mal function of our immune system which would cause a reaction to the normally harmless objects.   All such items are called "Allergens".    This  reaction  can lead to a variety of symptoms such as hay fever, eczema, asthma and other conditions popularly referred to as allergies.

To see the allergic symptoms, we should get exposed to the allergent for some time.  Other factors like smoking and pollution also cause allergy.  Normally the pollution from vehicles creates allergies in the cities.  Some people may become allergic to even a drug, food or insect byte.

Hope this information is useful to all