You do get autoimmune diseases this way. The thyroid does a good job of filtering out new immune cells that attack the body, but sometimes you will get an infe

You do get autoimmune diseases this way. The thyroid does a good job of filtering out new immune cells that attack the body, but sometimes you will get an infection where the targeted protein mimics a body protein. When that happens, you're stuck with an autoimmune disease. Example: https://en.wikipedia.org/wiki/Reactive_arthritis https://en.wikipedia.org/wiki/Reactive_arthritis