In fact, the early symptoms of esophageal cancer are not very obvious. Some people only experience a slight discomfort when swallowing, and others might feel mild pain behind the sternum. However, in the advanced stages, the symptoms become more noticeable, such as progressive difficulty swallowing. Additionally, if the tumor compresses the laryngeal nerve, it can cause hoarseness. If it compresses the trachea, symptoms like shortness of breath and dry cough can occur. If the tumor erodes into the aorta, it can lead to severe bleeding.