Allergy is a body in response manifestec because of entry of any origin body which doesn't suits it! These agents are called as allergens! When an allergen enters a body it manifests its response either in the form of rashes, respiratory distress, sneezing or some times with some other sysmptoms which can be dangerous too! Generally these things are observed when a particular person is allergic to a particular medicine! This allergic condition known as 'Anaphylactic shock' can be fatal also! So I feel that every body must know about the allergens which are harmful to them! I am allergic to dust and I have sneezes in presence of small amount of dust this condition is called allergic rhinitis! Do you have any allergy? Please respond! Thanks !