If gastric cancer is complicated by pyloric obstruction, symptoms such as nausea and vomiting may occur. 80% of early gastric cancer does not show obvious symptoms; some people may experience indigestion, as well as anemia, anorexia, and fatigue. If cardia cancer involves the lower part of the esophagus, it can cause difficulty in swallowing, while ulcerative gastric cancer bleeding can lead to vomiting blood or black stools. If gastric cancer metastasizes to the liver, it can cause pain in the upper right abdomen, jaundice, or fever, and if it involves the pancreas, it may cause radiating back pain. If there are long-term symptoms such as indigestion, physical weakness, and loss of appetite, it is advisable to actively visit the department of gastroenterology for a gastroscopy examination.