"acute upset stomach"

Sudden Severe Abdominal Pain and Diarrhea: Could It Be More than Just a Simple Upset Stomach?

You felt perfectly fine until morning, but suddenly severe abdominal pain and wrenching diarrhea struck. Why is this happening? Do you assume it is merely an upset stomach from eating something wrong? This powerful emergency signal from our body was noted with special attention in the Donguibogam, which called it sudden turmoil disorder.