Larry has an upset stomach.

拉里胃不舒服。

He had an upset stomach.

他胃部不适。

Yes. I have an upset stomach.

是的，我的胃很难受。

I'm suffering from an upset stomach.

我的肠胃正不舒服著呢。

Why I often upset stomach, still vomit.

为什么我经常肚子痛，还呕吐。