Meaning of the word "upset stomach" in English

What does "upset stomach" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

upset stomach

US /ˈʌpˌsɛt ˈstʌmək/
UK /ˈʌpsɛt ˈstʌmək/

Noun

a stomach that is experiencing discomfort, nausea, or indigestion

Example:
I have an upset stomach after eating too much spicy food.
She took some medicine for her upset stomach.