Can long periods of high stress cause geographic tongue? if so, if stress was reduced can geographic tongue disappear?

No one knows: No one really knows what causes this condition. All we know is that it is not a serious problem. It is not caused by an infection, and it is not related to any other disease. There is no "cure" for geographic tongue. Most patients will experience this condition as a mild nuisance or irritation. The condition usually waxes and wanes in severity and time periods and then clears up, often repeating t.

Geographic outbreak: The actual cause of geographic tongue is not clear, it is possible that stress could contribute as stress comes in many forms, emotional, physical, mental, biological... It is also not a proven fact that reducing the stress will reduce the incidence of geographic tongue. The patterns acn change daily often w/o symptom or side effect. It is a harmless condition so not to worry.