Hello, Abdominal discomfort and nausea can be due to reasons like acid reflux or it can be food related. As it gets relieved by belching, it s likely related to acidity. Antiacid medicines provide relief in such condition and I suppose your doctor has adviced the same for your son. There is a need for diet modifications as some food items can lead to this. You can consult a dietician for the same and follow his advice. Make sure your son drinks plenty of water through out the day. After this, if there is no relief then I would suggest you consult a gastroenterologist and follow his advice on the same. As there might be a need for other diagnostic tests to get done to see what the underlying cause for these symptoms. So that appropriate management can be done to relieve symptoms. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Manisha Auradkar, General & Family Physician