@catro I think you answered your own question. I have never been tested for celiac because 20 years ago it was very controversial and doctors didn't believe in it, so I had to go with what my gut told me (literally) after eating foods. I figured it out piece by piece with an elimination diet and found I had a gluten problem. I also developed other food allergies presumably because the gluten exposure caused a leaky gut and let the partially digested foods into my blood stream. I had pain in my hands and joints that stopped when I figured out what foods to avoid. You have to read food labels, and it may be one ingredient that is an issue, and you can't tell unless you test one component. I tested wheat by eating some plain flour, and knew that was it. I was also allergic to eggs, but later found out it was egg whites, and not the yolk, so I can hard boil an egg and eat the yolk. Sometimes testing isn't completely accurate, and it may depend on how long or how recently you were eating the gluten, and if your body would have mounted an immune response in that time period.