There are several synonyms for the term "stomach disease." One common synonym is "gastrointestinal disease," which refers to any illness or disorder affecting the digestive system. Another synonym is "digestive disorder," which is a more general term that encompasses conditions affecting not only the stomach but the intestines and other organs involved in digestion. Some other more specific synonyms include "gastritis," which refers to inflammation of the stomach lining, "ulcer," which is a sore in the lining of the stomach or small intestine, and "acid reflux," which is a condition where stomach acid flows back into the esophagus. It is important to seek medical attention if experiencing any symptoms of stomach disease.