About 70% of patients with malignant tumors need radiation therapy, during radiation therapy patients will have a variety of discomforts (radiation reaction), at this time the dietary regulation is crucial. 1.Loss of appetite. The most common is anorexia and dulled sense of taste. At this time, we should patiently encourage the patient to eat more, the diet is rich in nutrients, light, easy to digest food is good. Attention should be paid to the color, aroma, taste and shape of the dishes to mobilize the patient’s sense of vision and smell to achieve the purpose of increasing appetite. Diet should adopt the way of small meals, severe consumption of stimulating condiments, such as pepper, scabies, strong alcohol, avoid eating smoked, fried food and indigestible food. 2, dry mouth, sore throat, esophagitis. These symptoms are the most common radiation reaction in patients with head and neck or chest tumors, caused by radiation damage to salivary glands and mucous membrane. At this time, you can eat a cool, non-irritating diet, avoiding hard, coarse food. The temperature of meals should not be too hot, meat should be chopped finely, vegetables or fruits can be juiced and drunk if they cannot be swallowed, and cold boiled water can be taken in the mouth, small amounts of cold drinks can be consumed, and yogurt can be consumed more often. Dry mouth, sore throat, esophagitis severe, can be contained before meals or swallow a small amount of procaine solution, and then eat, the pain will be significantly reduced. You can also use maitake and licorice decoction as tea. 3. Nausea, vomiting, some patients will have these symptoms when abdominal tumor radiotherapy. Diet should be light and less greasy, eat less and more meals, put a small amount of ginger juice in the dishes to flavor, try to avoid unfresh or strange smell of protein food and other foods, also can contain fresh ginger slices in the mouth, or use Chen Pi, Persimmon Tee, Bamboo Roots, decoction water as tea, which can alleviate the gastrointestinal tract reaction. 4, abdominal distension, diarrhea. This is due to abdominal radiotherapy stimulation of intestinal mucosa, causing intestinal peristalsis caused by accelerated, at this time it is advisable to eat easy to digest, light less greasy food. Such as semi-fluid diet or less residue diet, avoid eating high fiber content of food and sticky, cold food. 5. Constipation. Should be appropriate to increase the amount of activity, eat more fresh vegetables, fruits, and other fiber-rich foods, such as potatoes, sweet potatoes, apples, pears and so on. If necessary, take the traditional Chinese medicine Ma Ren Lun Bowel Pills. 6. Frequent urination, urinary urgency, urinary pain and hematuria. This is the symptom of radiation cystitis, which often occurs during or after radiation therapy for bladder cancer, prostate cancer, cervical cancer, rectal cancer and other pelvic tumors. At this time, patients should drink more water, urinate more, and take appropriate amount of baking soda to make urine alkaline. 7. Decrease of blood image. Radiotherapy can cause bone marrow suppression, which is manifested by the decrease of white blood cells and platelets. In order to prevent bone marrow suppression caused by blood decline, pay attention to strengthen the nutrition, appropriate diet of chicken, duck, meat, etc. should be boiled, stewed, steamed and other methods of cooking. You can also choose foods that contain more iron, such as animal liver, kidney, heart, egg yolk and so on. Vegetables include spinach, tomato, celery, etc. Fruits can be given in the form of dates, pineapple, peaches, etc., jujubes, prunes, oranges, tangerines and so on. You can also use stewed chicken, peanut clothes and other blood tonic. While strengthening nutrition, radiotherapy patients should increase the intake of anti-cancer food (such as mushrooms, soybeans, cuttlefish, etc.), and should also take an appropriate amount of vitamins and certain trace elements under the guidance of the doctor, in order to improve their own immunity.