(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!"
29👍 3👎
Any sort of illness of the stomach or digestive tract.
Stomach ailments include Stomach flu, vomiting, Irritable Bowel Syndrome, etc.
7👍 1👎