<<Disclaimer: Verify this information before applying it to your situation.>> I received many, many responses to geographic tongue and they are still coming. Many people wrote to say that they had geographic tongue, but had always thought it was a personal condition, that had nothing to do with CD. Many were surprised to find out they were not the only one. Apparently there are many people out there with CD that have or used to have this condition, before going GF. None that reported the condition had made a connection with CD until it was mentioned. Some people, when the tongue had become painful, had tried to get medical help to clear up the condition. Most doctors told them that they had no idea what caused it, two suggested vitamins and one provided treatment. Some people did not indicate pain with the condition. There seems to be two scenarios reported in the mystery of the geographic tongue. One is a sign of malnutrition that comes from vitamin deficiencies that are documented in nutritional guides. These seem to be associated with particularly vitamin B or C deficiencies. The second side to this condition is the sudden developing of a sore or stripping of the tongue's coating when exposed to gluten. This happens when the person is in contact with something, like licking an envelope, that contains gluten. I know that I have a combination of the two reactions. Prolonged exposure to gluten creates in me, the swollen, red, fissured, shiny or the combined red edges with coated middle tongue that I consider the indication of vitamin deficiency. The other is an immediate reaction to gluten from a single encounter that alerts me to the fact that I have ingested gluten. One person mentioned that she had this reaction when eating citrus fruit. I also had this citrus reaction, but since going GF, I don't get it anymore, so I think there is a connection even with the citrus that, for me, relates to CD. Well, with all the responses, I believe we may be on to something. Some people wrote that they had CD, but had many relatives with a geographic tongue who did not have CD. My daughter, who claims she does not have CD, but has many of the symptoms of nutritional deficiencies, had geographic tongue as a small child. The doctor had no idea what caused it and said he saw it occasionally in his patients, but never knew the cause. It is also interesting to note that this condition can come and go without apparent cause. Perhaps geographic tongue might be a CD marker for some people. It doesn't matter if it is nutritional, (because CD causes malnutrition in a society that claims malnutrition does not exist) or a reaction to gluten contact. Each scenario could indicate a clue that might be helped by checking for CD. Does anyone from the medical profession check this list? Who could we bring this to that might be able to research it further in screening for CD. Thanks for all your responses. Carol NJ