Are allergies just a big misunderstanding?

What are allergies? What happens in your body during an allergic attack? If you're allergic to something, will that ever go away? For free home activities sign-up at www.WhoSmarted.com See omnystudio.com/listener for privacy information. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.