it might be due to high level of acid, if this is first episode without any particular reason try to take some immediate acid neutralizer. You can get it in every pharmacy.
7 พฤศจิกายน 2017
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98% chance it is indigestion. It can hurt like hell but it will pass.
7 พฤศจิกายน 2017
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In your stomach? It can be gastritis, stress, ulcer...you need to see a doctor