My 10 year old has been diagnosed with gastritis and peptic duodenitis after years of abdominal pain. She has been prescribed lansoprazole, but it hasn't made much difference so far. She doesn't normally have many symptoms of indigestion. She's already on a gluten free diet, but is there anything else that might help? She hardly ever takes ibuprofen, and it's not h pylori. In fact I'm at a loss as to what can have caused it, as obviously she doesn't drink alcohol either!