indigestion
dyspepsia
stomach upset
upset stomach

Your child's upset stomach may be caused by many things.

She looked the way you might look if you'd spent the past couple of days with an upset stomach.

I think he must have an upset stomach or something.

I think she'll be better off if she's got an upset stomach.

Just gave me an upset stomach, but the pain is completely gone!

All of the worrying and the upset stomach were gone.

He spent part of the second half in the locker room with an upset stomach.

Suddenly you got an upset stomach and the hot corn goes to your head.

My daughter didn't go to school today because she had an upset stomach.

In the second quarter, he left the game for a short time with an upset stomach.