Why You Get Allergic

[Carl Fredrik Ahl]

Hi,

I know how allergies works and how the body gets affected by it. What I wonder is why do you get allergic in the first place? Why will the body get sensitive to different things like pollen in the first place when some people are not?

[iNow]

Because the immune system is dynamic and changes as it experiences new stimuli every day. 

Also, as a general rule “why” is a question for philosophy. Science deals more with “how.’

[Strange]

The differing responses of people is due to both genetics (https://en.wikipedia.org/wiki/Major_histocompatibility_complex) and previous exposures.