Everything About Allergy

There are two kinds of allergic responses: acute response and late-phase reaction. Acute responses are physical reactions that manifest immediately after exposure to a certain allergen. It may subside after manifestation, or it may develop into a late-phase reaction which may be harmful. During initial exposure, the immune system reacts and produces anti-bodies. This process lead to symptoms such as mucous secretion, nerve stimulation and smooth muscle contraction. These symptoms may manifest in a certain area of the body, or localized, or in several areas at the same time or system-wide. For example, asthma is localized to the respiratory system.

(source: Wikipedia)

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