[llm_nerd]

The immune system is a complex, only partly understood system, and there isn't a single unifying solution to all of its edges. Broad understandings don't necessarily translate to individual cases.

At some point your immune system faced an adversary and conquered it, but one of the signatures it learned from the enemy encounter unfortunately also matches some molecular component of eggs. There is evidence that some people come out of norovirus infection with an egg allergy, for instance. Similar to how a bite from a lone-star tick can give you a meat allergy.

All sorts of auto-immune diseases can be kicked off by relatively benign things, and often we might never discover the cause. Our immune system learned the heuristics of something, but it's too broad so ends up looking too much like our thyroid glands, nerve myelin, pancreas, etc.

Maybe one day we'll be able to enum all of the signatures an immune system has learned and delete some of them.