The screening methods for esophageal cancer primarily involve checks of the esophagus, including upper gastrointestinal barium meal and gastroscopy. Gastroscopy, in particular, is a relatively accurate method for examining patients. This is because during a gastroscopy, biopsy samples can be taken, and pathology can definitively determine whether cancer is present. There might be issues regarding whether a patient can undergo a gastroscopy as it requires significant patient tolerance. Therefore, depending on the patient's health condition, if a gastroscopy is not feasible, an upper gastrointestinal barium meal can be conducted first.