For the people on metformin

I’m wondering if the people who have had stomach issues on metformin, whether XRor regular, did you have a sensitive stomach for other things before this?

I’m trying to see if it’s related. I read on here all the time of people having zero stomach problems on it, which sounds so nice! I wonder if you tend to have a stronger stomach in general or tend to not react to certain foods or certain meds before this, if you’ll naturally don’t react to Metformin then, and if you tend to react to things, then it’s more likely. Or is it more random and unrelated to previous history.