What causes your body to suddenly develop an allergic reaction to something later on in life that you weren’t allergic to before?

Question

i.e. how does ur body suddenly decide something is dangerous enough to warrant a reaction even tho it didnt cause it before

i might be using these tags wrong yeesh

In: 42

Answer 1

Your body doesn’t like foreign materials. It tries to kill them. Sometimes when you’re exposed to an allergen, the body misinterprets the cause as a danger. After the first exposure, your body creates memory cells that recognize the offender if it’s present again. Each time you are exposed, the symptoms get worse because your body is trying to fight it.