Breast cancer is one of the most common malignant tumors in women. In radiotherapy for breast cancer, attention should be paid to skin protection, good dietary habits, and active response to adverse reactions after radiotherapy such as bone marrow suppression and gastrointestinal reactions. 1. Skin protection: pay attention to skin protection because there will be scars after breast cancer surgery, and such scars may cause radioactive dermatitis after receiving radioactive rays, so it is necessary to protect the skin in the process of radiotherapy. After the radiotherapy is finished, don’t take a shower and rub the skin, which will cause skin breakage and increase the risk of infection. 2. Dietary habits: patients need to ensure a healthy nutritional status, balanced dietary structure, reasonable eating, to ensure high protein, high energy diet. Because in the process of radiotherapy, some patients feel that there may be a little obstacle to swallowing, but with the progress of radiotherapy, after the end of the recovery, these symptoms will slowly disappear. 3. Adverse reactions after radiotherapy. (1) Bone marrow suppression: Actively treat diseases related to bone marrow suppression: such as controlling blood sugar, avoiding infection, improving liver function, reducing the suppression of bone marrow by hypersplenism through surgery or other means. When using drugs, try to switch to drugs with less inhibitory effect on bone marrow. (2) Gastrointestinal reaction: anorexia, nausea, vomiting and other gastrointestinal reactions may occur. When such symptoms occur, bed rest should be observed, and the diet should be small and frequent, eat easy-to-digest food, don’t eat overly sweet, spicy and greasy food, and drink more water. Oral vitamin B6 and other drugs can also reduce nausea. After breast cancer radiotherapy, if you feel unwell, you should go to the hospital as soon as possible to confirm the diagnosis, and carry out standardized treatment under the guidance of doctor’s instructions. Pay attention to actively encourage patients to participate in aerobic exercise, such as jogging, fitness and so on, which will increase patients’ confidence in overcoming the disease.