Well, generally speaking, wheat allergy can cause dark circles under your eyes. Maybe many people have known that dark circles are due to the stress you have. And also others think dark circles can be caused by unbalanced life habits. Well, it is right. But on the other hand, you also should know that dark circles under the eyes can be caused by wheat allergies too. as we know that dairy products and yeast are also guilty. So people can go for years and into middle age without showing symptoms at all and then they will burst upon you. In some cases, children will show the allergy symptoms almost immediately. At this moment, you should boost your iron intake and cut down on the wheat and the problem should clear up. Of course, if your symptom is related to other factors like the stress. You just need take a good rest, and eat some more fruits and using moisture is also effective.