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

If we understood this process we might be able to reverse it. But it is very hard to figure out how the immune system works and how allergies develop or goes away. Sometimes allergies tend to just appear out of nowhere. It does appear to happen more often when someone gets sick from other reasons while they are exposed to the substance they become allergic to. So it might seam like the immune system gets confused thinking that the substance is the reason you get sick. This is however a very simplified explanation, in fact too simple. We just do not have any idea on how this works and just have some simple observations.