stomach ailments

Any sort of illness of the stomach or digestive tract.

Stomach ailments include Stomach flu, vomiting, Irritable Bowel Syndrome, etc.

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upset stomach

(Honestly? No one has defined this yet?) When you feel pain or discomfort in your stomach due to overindulgence or something like that.

"Jeez, after that entire pizza I got an upset stomach to deal with!"

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