Hi, my daughter who is 12 now has had stomach ache/pain for at least 6 years and has had a blood test, and they did not find anything. I believe her. I also had this pain when I was little and still get it too. A lot of times its the food and drinks I might have and was wondering if that could be her problem too. Thank you.
Cellophane you for asking question. I am Chat Doctor.  By stomach pain, I presume that you mean pain in epigastric region, that is center of the upper abdomen. Epigastric pain also has the number of causes. If I see a patient who has epigastric pain for such a long time. I would order baseline tests that is, blood CP, liver and renal function test and more importantly an upper GI endoscopy and abdominal ultrasound and will also look for H-pylori antibodies to completely rule out some common causes. The above-mentioned test should be done and the reports of these tests will aid in making a comment and final decision. I hope you have understood my point. You may ask me more questions anytime. If you have already done these tests, feel free to share their reports. Regards. 