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This could be as simple as digestive problems with gaseous distention. It requires medications for indigestion or gaseous distention like Charcoal tablets, passing by symptoms of gastroenteritis. If diarrhea and vomiting develop, food poisoning is one of the reasons as well. Also, it can be a kidney or ureter problem (stone or salts). This site can suggest acute appendicitis as well, which should be dealt with as an emergency. In all circumstances, I recommend a visit to your general physician or internal medicine specialist for further history taking, clinical examination, and evaluation.
Visit your doctor for further evaluation.