During radiotherapy for esophageal cancer, patients experience vomiting of food or nausea and vomiting symptoms. Esophageal cancer is mostly carried out by radiotherapy and chemotherapy at the same time, and radiotherapy alone rarely causes esophageal vomiting, but it does not mean there is none. The main reasons for vomiting are as follows: 1. esophageal stenosis, because in the process of radiotherapy for esophageal cancer, its own lesion will lead to esophageal stenosis; in addition, esophageal edema will occur in the process of radiotherapy, which will further aggravate the stenosis, and the aggravation of esophageal stenosis will lead to difficulty in eating, and food will not enter the stomach when eating and will be vomited, which is a more common one; 2. concurrent radiotherapy and chemotherapy, chemotherapy can cause nausea and vomiting, chemotherapy Chemotherapy drugs mainly stimulate the gastrointestinal tract and stimulate the vomiting center, these two reasons will lead to vomiting; 3, the lesion is more downward during radiotherapy, such as lower thoracic esophageal cancer, at this time the lymph node of the lung gate or the left lymph node of the stomach will irradiate the stomach tissue, which can cause vomiting. Vomiting itself is a protective reaction, if a certain part is not irradiated, it will not cause vomiting. In general, vomiting during radiation therapy for esophageal cancer is mainly due to the above-mentioned factors. Different treatments should be taken to prevent vomiting according to several different factors and according to the irradiation scope and irradiation location. At present, the chance of vomiting during radiotherapy is low.