This sounds like my daughter. WE have since identified dairy products as the culprit. She never complains anymore. I was reminded of this just last night. We went to a wedding and as a "treat" we let her eat the cake even though it was butter cream frosting. WE got home and she was complaining her stomach hurt. It struck me as it used to be so often I would hear this but it had been a long time since I had heard it. I pointed out that the butter cream was responsible as I want her to make responsible choices. Hopefully in the future she will have more slef control...so hard for a 4 year old but she is pretty good at switching for a treat we bring from home. ANyway, definately get it checked out that it is NOT an ulcer but it could be food allergies. Good luck, Julia