Frequent acid vomiting is not necessarily a symptom of early gastric cancer, but may also be a sign of gastritis or reflux esophagitis. The common cause of frequent acid vomiting is gastroesophageal reflux disease, which usually appears about one hour after meals and may be aggravated when bending over, lying down or increasing abdominal pressure. Besides gastric cancer, chronic gastritis, gastric ulcer, bile reflux gastritis, pyloric obstruction, dyspepsia and other diseases can also show the phenomenon of frequent acid vomiting. While there are usually no obvious symptoms in the early stage of gastric cancer, a few patients may experience fullness and discomfort, indigestion and acid vomiting, but gastroscopy can help distinguish the cause of frequent acid vomiting. If patients feel nervous and anxious, they can go to gastroenterology department of hospital for gastroscopy and if necessary, pathological biopsy can be taken to distinguish whether it is stomach cancer or not. Patients do not need to be too alarmed, as frequent acid vomiting does not necessarily mean early stage of gastric cancer, and even if it is confirmed to be early stage of gastric cancer, early treatment is not without the possibility of cure.