During radiotherapy, it is good to eat some high protein and high calorie food, and it is good to eat some soft and rotten food that is easy to digest. In the radiotherapy of head and neck tumors, and in the radiotherapy of facial tumors, after radiotherapy, the mouth and tongue fester. At this time, try to eat soft, rotten and digestible food. Basically, it melts in the mouth without chewing, and you can eat food with more oil. Some patients are receiving radiotherapy in the esophagus and gastrointestinal tract. At this time, they basically have to eat a thick food, which is almost instant in the mouth. There are also foods with higher fat, so that the mucous membrane of the patient will not be damaged, and the chance of infection may be increased when food passes through. After meals, you must drink some water to wash, so as to reduce the chance of infection. It is recommended to eat fine food and produce less stool when the rectum is undergoing radiotherapy, because there will be sudden weight and more stool times.