The document summarizes information about esophageal cancer. It describes the esophagus anatomically and histologically. It then discusses the types and causes of esophageal cancer, including risk factors like smoking, alcohol, and gastroesophageal reflux disease. The document outlines the staging of esophageal cancer and lists common symptoms. It also provides details on diagnostic testing, treatment options like surgery, chemotherapy, and radiation therapy, and statistics about esophageal cancer.