system
Given the following post, respond as if you're commenting on Reddit:
human
If vaccines work by introducing a small amount of a foreign substance to your body to trigger an immune response to develop resistance, why don’t allergies work the same when they also trigger an immune response when exposed to something foreign to the body?
gpt
Allergies are harmless irritants that the body IS triggering an immune response against. All of the negative effects are due to the release of histamines, which is an attempt to “defeat” the “foreign invading” substance. It isn’t the bee’s venom, for example, that kills you - it’s your own body’s defense mechanism trying to defeat the venom that kills you. 
     
The way to treat allergies is to shut down the body’s immune response. Anti-histamines are used, but there’s also exposure therapy which is meant to get the body used to the foreign (or perceived foreign) bodies.