Upset stomach cause by cold?

I'm just getting over a cold with clear drainage and a bad cough. My stomach is somewhat upset, and I think it might be related to the cold. Like I said, I'm getting better, so there's not much drainage today, but I'm wondering if the upset stomach is from the "cumulative effect" of the later few days. (I always get an upset stomach when I have a cold.)
Answers:    Sometimes some of that drainage ends up contained by your stomach & can upset it. I often get an upset tummy whenever I take Nyquil.


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