Most of the bulging lumps in the stomach are found during gastroscopy, which may be caused by gastric polyps, benign gastric tumors, gastric cancer, and so on. 1. Gastric polyp: if the patient has Helicobacter pylori infection, chronic inflammation stimulation, diet and living habits and other factors, gastric polyp may appear, which is manifested as a bulging mass in the stomach. 2. Benign gastric tumors: benign gastric tumors are mostly mesenchymal tumors, neuroectodermal tumors, fibrous tumors, lipomas, hemangiomas and so on, which are manifested as mound, hemispherical or spherical bulge. 3. Gastric cancer: patients with bulging mass in stomach may also be caused by gastric cancer. It is mainly due to the combination of factors such as bad dietary habits, Helicobacter pylori infection and heredity, etc. Gastroscopy of the patient can show the bulging mass at the base of the stomach. Patients are often accompanied by various symptoms such as abdominal pain and black stools. It is recommended that when patients find a bulging mass in the stomach, they should go to a regular hospital in time, and under the guidance of the doctor, carry out the relevant examinations, and take targeted treatment according to the specific results of the examination.