Glycoantigen 724 is commonly referred to clinically as CA724, or gastric cancer antigen, and is a non-specific tumor marker that is generally used as an aid in the diagnosis of various gastrointestinal cancers and ovarian cancer. The normal range of glycoantigen 724 is 0-6.9 U/mL. If only the value of glycoantigen 724 is high, it is not necessarily meaningful because about 3.5% of healthy people have high glycoantigen 724. Only when the value is tens or hundreds of times higher than the normal value, malignancy is highly suspected. There are many causes of high CA724, such as ovarian, gastric, colorectal, pancreatic, and breast cancer. CA724 can also be mildly elevated in a small number of normal individuals and patients with benign gastrointestinal diseases. If there is a high level of glycoantigen 724, patients need to go to the hospital for specific examinations to clarify the cause; if the index is only slightly elevated, especially if it reaches two times the upper limit, attention needs to be paid to close follow-up for comprehensive analysis and diagnosis. If the patient is currently detected with high CA724, it is recommended to avoid smoking and alcohol abuse, eating spicy and stimulating foods such as chili and pepper to avoid stimulating the gastrointestinal tract, eating more fresh foods, paying attention to dietary hygiene, and having regular medical checkups.