If you want to burp but can’t, it is not stomach cancer. Occasionally, some patients may experience nausea and vomiting, but the symptoms are relatively mild. In addition, some patients may also experience abdominal pain occasionally, but the pain is mostly vague and mild in nature, so patients may easily ignore it. If the patient is in the progressive stage of gastric cancer, he or she will have obvious clinical symptoms, such as pain in the upper abdomen and weight loss. At this time, patients should pay enough attention because some patients will also have indigestion or abdominal distension, sometimes jaundice, ascites, and even swollen supraclavicular lymph nodes. If the patient has advanced gastric cancer, it usually indicates that the patient has a poor prognosis and will suffer from systemic organ failure, be relatively thin, and even show signs of cachexia.