The symptom of acid reflux in stomach cancer is mainly due to the tumor in the patient’s stomach, which affects the peristalsis of the stomach and intestines and therefore leads to the obstacle of gastric emptying. Because gastric fluid is produced in the stomach cavity every day, after the gastric emptying obstacle, the gastric fluid in the stomach cavity of the patient increases, and then the symptom of acid reflux may appear. In addition, it is also possible that stomach cancer leads to abnormal function of gastric mucosa, so it also leads to increase of gastric fluid production, which leads to acid reflux symptoms in the stomach. Overall speaking, the symptoms of stomach cancer are atypical, which may be confused with the symptoms of gastritis or gastric ulcer. The main symptoms include hidden pain and distension in the abdomen, and some patients with stomach cancer may suffer from abdominal pain of a more intense nature, and at the same time, they may suffer from a series of digestive symptoms including regurgitation of acid, belching, burping, and even black stools, and so on.