Esophageal stenosis mainly refers to the narrowing of esophageal lumen caused by the disease of esophagus itself or external pressure, which is mainly manifested as dysphagia, pain in swallowing, reflux sensation after eating, and emaciation. For example, esophageal cancer patients may have esophageal stenosis in the advanced stage, or swallowing corrosive chemicals may cause serious damage to the esophageal mucosa and form scar tissue, which may lead to esophageal stenosis, and they should go to the hospital immediately if necessary.