Esophageal cancer, i.e. cancer of the esophagus, generally does not occur suddenly. The malignant disease of esophageal cancer itself is a chronic consumptive disease, and the occurrence and development of the disease is a relatively slow and complicated process, and the disease does not occur suddenly. In the early stage, esophageal cancer often does not show obvious symptoms. However, in the absence of symptoms, the lesion in the patient’s body is in the process of continuous development, and with the aggravation of the disease, a variety of symptoms will appear, such as difficulty in swallowing, weight loss and so on. The occurrence and development of esophageal cancer is a chronic process, and the occurrence of cancer is often the result of long-term effects of multiple factors. Individuals who are not feeling well should consult a doctor as soon as possible to find out the cause of the disease.