The early symptoms of esophageal cancer are often not obvious, but the typical symptoms of middle and late stage esophageal cancer are progressive dysphagia, firstly, it is difficult to swallow dry food, then semi-liquid and liquid food. Common symptoms include: 1. choking sensation of swallowing food. 2. 2. vague pain in the posterior sternum and subxiphoid process: obvious when swallowing rough, burning or irritating food 3. foreign body sensation in the pharynx and esophagus 4. dryness and tightness in the pharynx, easily misdiagnosed as pharyngitis. 5. Posterior sternal stuffiness and swelling very well discomfort. Late symptoms such as chest and back pain indicate that the tumor has invaded extra-esophageal tissues, hoarseness indicates that the tumor has invaded the laryngeal nerve, and invasion of trachea may form esophagotracheal fistula and cause choking and coughing when eating, and symptoms such as cachexia, hemorrhage and cancer perforation may also appear in late stage. Strategies to improve the cure rate of esophageal cancer: early detection, early diagnosis and early treatment