When you experience an uneasy feeling in your stomach, it's known as "stomach upset." However, there are many other words that can describe this feeling. One synonym is "indigestion," which refers to difficulty with digestion, including bloating, gas, and heartburn. "Nausea" is another word used to describe the feeling of upset stomach, often accompanied by an urge to vomit. "Gastrointestinal distress" is a more technical term that can describe a variety of digestive issues, including upset stomach. "Dyspepsia" is a specific type of stomach upset that is characterized by discomfort and pain in the upper abdomen. Other synonyms include "tummy ache," "upset tummy," and "digestive discomfort." No matter which word you use, the discomfort that comes with stomach upset can be extremely discomforting.