Can different type of coffees cause stomach upset?

[Santorian]

All my life I have been susceptible to stomach upset and heart burn.
So I've learn to live and work around it. Recently I've started to get stomach upset outside of the norm I already know.
The only thing I can think of, recently I started a new job and we have the Donut Shop original regular medium roast K cups, which I drink 2-3 a day.
At home, since forever, we used the Folgers medium roast.
The Donut shop K cups coffee doesn't seem acidic or sour, but it feels a little muddy.
Can this be the problem or should I look for other reasons?
Thank you,

 

[meforevercrazy]

Hhhhmm I've never had problems with mixing some up. Best to get checked.

 

[Royallie]

I do not think so