Heartburn during radiotherapy for advanced cervical cancer may be due to side effects caused by radiotherapy, or it may be due to chronic gastritis and gastroesophageal reflux of patients. 1. Side effects of radiotherapy: radiotherapy will produce some adverse reactions, such as radioactive skin injury, radioactive enteritis, etc. Patients suffer from vomiting and nausea, indigestion, heartburn and other digestive system discomforts. 2. Chronic gastritis: patients with advanced stage of cervical cancer, whose body itself is weak, may have chronic gastritis. This disease will lead to loss of appetite, nausea, hidden pain in epigastrium, heartburn and regurgitation after eating. 3. Gastroesophageal reflux: when patients have gastroesophageal reflux, it will cause gastric acid reflux, which will lead to heartburn. During radiotherapy for advanced stage of cervical cancer, if any discomfort occurs, go to the hospital for examination in time, clarify the cause and treat it actively to avoid aggravation of the condition.