Your son is not allergic and probably would have shown up a food intolerance earlier.All the tests are negative and the doctor's examination of his abdomen is normal.His abdominal pain sounds like a condition called periodic abdominal pain or sometimes just periodic syndrome.This may be related to migraine if you have a family history of migraine. Treatment is difficult but children usually grow out of this syndrome. Increase his fibre intake,keep him off lactose containing dairy foods and give him a probiotic daily.He should NOT eat ripe bananas, hard yellow cheese, marmite and chocolate.
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