There are no specific clinical symptoms in early stage of esophageal cancer, if symptoms appear, most of them are in progressive stage. Typical manifestation of middle and late esophageal cancer is progressive dysphagia. Early esophageal cancer is often found by gastroscopy or physical examination, and early esophageal cancer refers to lesions where the tumor is located in the mucosal layer, such as endoscopic mucosal roughness, bulging and cauliflower-like swelling. However, for early alarm signals, one should be alert to early esophageal cancer, such as uncomfortable sensation when swallowing coarse and hard food, such as burning sensation, pinprick-like or pulling or friction-like pain at the back of the sternum, slow passage of food after swallowing and feeling of food stagnation, choking sensation or foreign body sensation. For this kind of food obstruction choking, stagnant feeling, swallowing water after the symptoms of relief or disappearance, and this kind of symptom lasts for a long time, the symptom is repeated, sometimes light, sometimes heavy, should cause enough attention.