This can be due to variety of reasons.
If you have eaten more than you are used to eating, your stomach has to expand to accommodate the excess food. Most internal organs have stretch rectors that warn us, so as to avoid rupture.
If you have eaten food that is very spicy or acidic, you may have inflamed the stomach wall and this will cause pain. Also, if you are taking medications like aspirin or drinking alcohol, the same thing can happen.
You may have a medical condition that can get worse with food...an ulcer or gallstones. You should a doctor if it persists.
Hope this helps
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