Side effects after neck radiotherapy mainly include skin reaction, dietary pain, bone marrow suppression and so on. 1. Skin reaction: after neck radiotherapy, there will be skin hyperpigmentation in the irradiation field, reddening of the skin, and in some cases, even ulceration. Skin protectant can be sprayed before radiotherapy to reduce the damage of radiation to the skin. Wear low-necked clothes to minimize friction. When ulceration occurs, it is necessary to consult a doctor in time and standardize the treatment under the doctor’s guidance, such as using recombinant human epidermal factor gel externally. 2. Eating and drinking pain: eating and drinking pain will occur after neck radiotherapy, mainly because of radiation damage to the esophageal mucosa, resulting in esophageal edema. Mannitol can be standardized under the guidance of the doctor to reduce esophageal edema and alleviate the symptoms. 3. Bone marrow suppression: Bone marrow suppression will occur after neck radiotherapy, which is mainly manifested as leukopenia, low platelet, anemia and so on. General radiotherapy patients need to review the blood routine every week, such as bone marrow suppression phenomenon, under the guidance of the doctor to standardize the treatment, such as the application of Diyu white tablets, caffeic acid tablets, blood treasure and other symptomatic treatment. At the same time, patients with neck radiotherapy should pay attention to light diet, avoid spicy and irritating foods such as chili, ginger, quit smoking and alcohol. Drugs should be used in accordance with medical advice.