For what it's worth, i’m a couple years past my goal now, mostly maintaining, so this is old-memory territory. But I do remember the odd upper belly ache early on.
Mine showed up around day three, a sore, hollow feeling just under my ribs, usually after I ate too quickly or drank coffee on an empty stomach. It made me nervous because it wasn’t what I expected.
I wasn’t doing anything wrong—my body was just adjusting.
What helped me was eating slower, keeping portions small, and noticing that it eased when I sat upright instead of slouching on the couch. It faded by the end of the second week.
I did ask my own clinician because I wanted reassurance, and that was the right call for me. If you’re in that early stretch, you’re probably not alone.
Did yours settle on its own, or did you end up asking your doctor about it?