Noun
stomachache (countable and uncountable, plural stomachaches)
A pain in the abdomen, often caused by indigestion. (The pain is usually lower than the stomach and related to the intestines.)
On that morning, we latched onto our parents’ legs, cried to go home or, in my case, faked a stomachache and actually did get sent home. Source: Internet
Have a stomachache that won’t let up? Source: Internet
I've got a stomachache and diarrhoea. Source: Internet
He ends up with a stomachache and a trip to my office. Source: Internet
That night he had a stomachache! Source: Internet