CA724, also known as glycoantigen 724, is more frequently elevated in gastric malignancies. If the index is a little high, it depends on the specific value. It may be a tumor, but also related to other benign lesions, such as gastritis, gastric ulcer, etc. Other dietary factors, such as eating more meat, or having indigestion, may cause the index to be high. If the index value alone is not able to diagnose malignant tumor, if it is much higher than the normal reference value by tens or even hundreds of times, the possibility of gastric malignant tumor is highly suspected. Gastroscopy is needed to take biopsy pathology through gastroscopy to confirm the diagnosis of gastric tumor, and if it is early gastric cancer, early detection and early surgery will be more effective.