My endocrinologist tested me for celiac and said the test was negative and i didn’t have sensitivity to gluten. But I have since learned that not having celiac disease does not mean you are not gluten sensitive and some tests for celiac don’t pick up all gluten sensitivity. Sensitivity to gluten definitely can be the underlying cause of PN. After being off of gluten for a time my PN had begun to be less of a problem, but last evening I slipped and ate a handful of cheese crackers that I later learned also contained wheat flour. My PN came back last night with a vengeance. I think the best test for whether gluten sensitivity is causing my PN is for me to go on and rigorously stay on a gluten free diet.