I have a different answer for you.
Is this above or below the navel.
If above, the possibilities are ulcer, gallbladder disease, pancreatitis, and a colon problem.
If below, colon problem, bladder problem, problem with the ureter [stone].
Small bowel problems can cause problems both above and below and at the navel level.
Muscular problems can do it.
This is not typical of a hiatal hernia causing this pain.
A ventral hernia would have a bulge.
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