I think that the Montreal Steak seasoning has minced onions or garlic in it. Perhaps that is what is causing the problem. I know alot of people (myself included) have a reaction to those. Although I think there is a very small amount of those things in there and I have never had a problem with it which doesn't mean that your condition is not more sensitive to those ingredients.PS - Joolie, it is very yummy and it is good on just about every kind of meat (steak especially). It is a mixture of coarse salt, black and red pepper, garlic, and what is listed as "spices?!?" on the ingredients list.