Esophageal cancer is esophageal cancer, which is a relatively common disease in clinical practice and does not have 15 clear signs and symptoms. Early esophageal cancer is often not accompanied by obvious symptoms, some patients may have symptoms such as swallowing disorder or painful feeling, the symptoms are sometimes mild and sometimes heavy, usually progress slowly, some patients may find occupying lesions or mucosal lesions by clinical microscopy: 1. Difficulty in swallowing: the more common symptom is that there may be occasional discomfort when swallowing food, the speed of food passing through the esophagus becomes slower, accompanied by stagnation or foreign body feeling, some patients There may be a foreign body sensation of food adhering to the esophageal wall or a feeling of tightness behind the sternum. Generally, this symptom occurs at the lesion site, and the choking and stagnation sensation is often relieved by swallowing water; 2. Pain: Some early esophageal cancer patients may experience burning, stabbing or pulling and rubbing pain behind the sternum or under the glabella when swallowing food, especially when swallowing rough or irritating food, and the pain is intermittent in the early stage, but with the development of the disease, the cancer tumor gradually invades the surrounding tissues, and then the pain may be persistent. If esophageal cancer develops in the throat, patients may experience dryness, tightness and foreign body sensation in the throat, especially when swallowing rough food or emotional fluctuations; 4.chest discomfort: some esophageal cancer patients’ tumors may squeeze the chest or trachea, resulting in chest discomfort, pain, shortness of breath, belching and other symptoms; 5.esophageal mucous membrane ulceration: some esophageal cancer patients’ tumors may squeeze the chest or trachea, resulting in chest discomfort, pain, shortness of breath, belching and other symptoms. Mucosal ulceration of esophagus: some patients with esophageal cancer may have different degrees of roughness and erosion of esophageal mucosa under microscopic examination, and ulcer-like or nodular changes, etc.