But genetic mutation is not scientific, how can genes mutate, you have not been through the cosmic rays strong radiation ~ with allergies is not always allergic to people

, this is by the mechanism of allergy occurs to determine. When a person with allergies is first exposed to an allergen

(antigen

),

the body does not produce allergic symptoms

but the body produces a kind of specific antibody

,

and when this specific antibody

accumulates to a certain amount

,

if exposed to the antigen again,

the body produces a kind of antibody

,

and when the body is exposed to the antigen again, the body produces a kind of specific antibody

. When this specific antibody accumulates to a certain amount

, when exposed to this antigen again

, the specific antibody will combine with it

, causing the body's media cells to degranulate

, releasing a variety of mediators

, resulting in a series of allergic symptoms. The condition for the development of allergy

is to be able to come into contact with the same allergen several times. Knowing this

, it is not difficult to understand

, to some kind of pollen allergy people why only in the spring allergy

, and in other seasons will not be onset of disease

, it is precisely because of these flowers are only in the spring open

, only in the spring may come into contact with the pollen of the cause.