Generally breast cancer is benefited by the implementation of radiotherapy. Breast cancer is one of the most common malignant tumors among women, and its impact on women’s physical and mental health should not be underestimated. For breast cancer patients, comprehensive treatment is often needed after diagnosis of the disease, and radiotherapy is a commonly used treatment for patients, which can help them control the disease effectively. Radiotherapy is a common treatment for breast cancer patients after breast-conserving surgery, breast reconstruction, neoadjuvant chemotherapy, modified radical surgery, and localized recurrence, in order to improve the therapeutic effect and quality of life. Although radiotherapy is an important treatment for breast cancer, there are indications and contraindications for radiotherapy, so the need for radiotherapy for breast cancer patients should be evaluated by a physician. Women who notice some unusual symptoms in their breasts are advised to seek medical attention.