What is the meaning of upset stomach?

A disorder of digestive function characterized by discomfort or heartburn or nausea.
- synonyms: indigestion, dyspepsia, stomach upset

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APA	WordNet. (2010). upset stomach. Retrieved September 20, 2026, from http://smartdefine.org/upset_stomach/definitions/1318488
Chicago	WordNet. 2010. "upset stomach" http://smartdefine.org/upset_stomach/definitions/1318488 (accessed September 20, 2026).
Harvard	WordNet 2010, upset stomach, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/upset_stomach/definitions/1318488>.
MLA	WordNet. "upset stomach" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/upset_stomach/definitions/1318488>

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