Gastrointestinal submucosal neoplasms are tumors arising from the musculoskeletal, submucosa, or muscular layers of the gastrointestinal tract wall. The most common submucosal tumor is in the stomach with a frequency of 1/300 cases of gastroscopy. The disease is characterized by a circular lesion that protrudes into the lumen of the gastrointestinal tract covered by normal mucosa and is discovered incidentally during gastroscopy or routine colonoscopy. There are many patients who are often afraid when the doctor diagnoses themselves with a submucosal tumor, not knowing whether this tumor is large or small, benign or malignant, how to treat it, whether to take the medicine, whether it is necessary, or not, to treat it. then will it recur elsewhere....? All questions and questions above will be introduced by the doctor in the following article: