Many possibilities: Many things are in the abdomen: stomach, pancreas, liver, small intestine, gall bladder, large intestine, abdominal muscles, etc... An exam by his regular doctor can help figure it out, and follow his progress. Stomach flu (common), toxin ingestion (not too rare), appendicitis (not too rare), pancreatitis, stomach ulcers, twisted bowel... are also possible.
Answered 2/19/2020
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