The early symptoms of esophageal cancer are often nonspecific and intermittent, thus many patients do not take them seriously and delay the condition. Clinically, common early symptoms of esophageal cancer include a choking sensation when swallowing food, which is more noticeable in patients who swallow dry food or other foods that are not well chewed in large bites. Additionally, there is discomfort or a feeling of fullness behind the sternum. Thirdly, there is a sensation of a foreign body in the esophagus, with about 20% of patients experiencing this sensation when swallowing, as well as dryness and a feeling of tightness in the throat. Furthermore, there is a slow passage and a sense of retention of food.