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Greetings,Thank you for your question.I am Dr. Su S.I will try my best to help you.
How frequently does he develop nausea?
Does he have diarrhea/abdominal pain or any other symptom?
Did doctor prescribe any medicine?
How is his diet?
How is his growth and development?
Thank you for the input.I am sorry for his sufferings.Nausea or vomiting can come from a few factors. Those can be in the gastrointestinal tract or other non stomach causes. There can be gastritis, reflux.Children can develop gastritis.Constipation can be associated with nausea.Liver disease / hepatitis, gall bladder issues can produce such symptoms but last test results did not show any abnormality.Food intolerance can be possible.You are watching his diet.Make a diary, note his food and symptomsAs it is happening for a long time, you can ask a referral for a gastroenterologist.Urine infection, kidney disease, can cause nausea without any other apparent symptoms.Further tests can be considered for those probables.I would advise to consult doctor to have a review.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish him healthy life.Regards.