What are the signs and symptoms of Esophageal Cancer. Learn about what esophageal cancer is; how it's diagnosed; and how it's treated. For more information about esophageal cancer, visit http://www.dana-farber.org/Adult-Care/Treatment-and-Support/Treatment-Centers-and-Clinical-Services/Gastrointestinal-Cancer-Treatment-Center/Center-for-Esophageal-and-Gastric-Cancer.aspx