A 1 cm bulge under the gastric mucosa is a description of gastric lesions during gastroscopy, which may be benign occupying lesions, malignant tumors, hemangiomas and so on. 1. benign occupational lesions: gastric polyps, gastric lipomas, smooth muscle tumors and other benign occupational lesions of the stomach, gastric mucosa, glandular tissue hyperplasia, resulting in gastric submucosa bulge, may have diarrhea, abdominal pain and other symptoms, may also be asymptomatic. 2. Gastric malignant tumor: gastric cancer, gastric malignant lymphoma and other malignant tumors of the stomach, there may be a 1 cm bulge under the gastric mucosa, and there may be symptoms such as poor appetite, lethargy, anemia and weight loss. 3. vascular malformation: vascular malformation in the gastric mucosa can form a bulge on the surface of gastric mucosa, usually without special symptoms. If there is a 1 cm bulge under the gastric mucosa, you should go to the hospital, under the guidance of the doctor, you can improve the endoscopic biopsy to understand the cause of the bulge, and follow the doctor’s instructions for treatment.