Esophageal cancer is cancer, also called malignant tumor. When patients have symptoms of progressive dysphagia or obstruction, or even nausea and vomiting after eating, the possibility of esophageal cancer should be considered at this time. It is recommended that patients should perform gastroscopy and send pathological biopsy under gastroscopy, which is the gold standard to diagnose esophageal cancer. Often, blood tumor markers will also be high, and then CT of chest and abdomen will be performed for clinical staging. If clinical staging shows no distant metastasis, those with earlier staging can undergo radical surgery.