The most typical symptom of esophageal cancer, especially in its advanced stages, is difficulty swallowing. As esophageal cancer progresses, patients may further experience difficulty swallowing semi-liquid food, eventually leading to difficulty swallowing even water and saliva. Additionally, as the cancer develops, it might compress the trachea, resulting in symptoms like sticky sputum and difficulty in expectorating. Consequently, due to difficulties in eating, progressive severe weight loss and fatigue often occur. Furthermore, some patients may also experience chest or back pain, and in some cases, an esophageal-tracheal fistula might occur, leading to severe respiratory difficulties and intense choking. Moreover, after advanced esophageal cancer has spread, it may also cause jaundice, ascites, and can metastasize to other parts of the body, potentially resulting in various symptoms.