Early symptoms of esophageal adenocarcinoma are not very obvious, and may include discomfort behind the sternum, mild choking sensation in the esophagus after eating, and pain, foreign body sensation and burning sensation in the lumen of the esophagus, etc. These symptoms may occur intermittently or may last for several years. In progressive esophageal adenocarcinoma, due to the narrowing of the lumen caused by the tumor infiltration, the typical symptoms of esophageal cancer will appear, such as progressive dysphagia, which is difficult to swallow when eating hard food such as steamed buns at the beginning, and then cannot swallow hard food, and gradually change to soft, semi-liquid or liquid diet. When the obstruction is more severe, even liquid food or even saliva cannot be swallowed. There is also pain behind the sternum, and esophageal adenocarcinoma sometimes produces pain in the upper abdomen and pain below the glabella. There is also vomiting. When the tumor is particularly large and the obstruction is severe, a large amount of mucus and food is often vomited after eating.