A smooth cardia bulge usually refers to an elevated or submucosal bulge with a smooth surface at the cardia of the stomach, which can be considered as gastric polyps, smooth muscle tumors, and mesenchymal tumors. They are usually benign lesions, and prompt diagnosis is recommended. Gastric polyps are often considered to be gastric polyps if the cardia mucosa is elevated and smooth. Submucosal elevation with smooth surface may be smooth muscle tumor, mesenchymal tumor, etc., some of which may protrude into the peritoneal cavity and grow towards the plasma membrane side, and both of them need to be differentiated by immunohistochemical examination, CT or ultrasonic endoscopy. In conclusion, smooth cardia bulge is usually a description of a space-occupying lesion found by gastroscopy. It is recommended that the patient should consult a specialist when the lesion is detected in order to avoid delay in treatment.