<<Disclaimer: Verify this information before applying it to your situation.>> To my knowledge, Thyroid Disease is an autoimmune disease, like Diabetes and people who get Celiac have a pre-disposition to get other autoimmune diseases. Just because you have Celiac does not mean you will definately get the other diseases, but the chances are greater than in the general public. I am not aware of anything you can do to prevent this, as it's a matter of genes you've inherited and conditions unknown that are a precurser. If anyone has more knowledge on this subject, please feel free to add, or correct me if I'm wrong. Lynn in Omaha