It is not possible to determine purely whether parotid cancer patients who receive radiotherapy will experience significant side effects in their bodies. Parotid adenocarcinoma is a kind of malignant tumor occurring in parotid gland epithelium, and the main treatment of parotid adenocarcinoma is mainly based on surgery, and some patients will be supplemented with radiotherapy before and after surgery. However, different radiotherapy protocols, different physical condition of patients and different severity of disease will affect the side effects of radiotherapy, so it is impossible to judge whether the side effects of parotid cancer radiotherapy are big or not. Side effects of radiotherapy for parotid cancer include acute side effects and long-term side effects. Acute side effects commonly include radiation oral mucositis, loss of sense of taste, etc. Long-term side effects include fibrosis of oral mucosa, hyposecretion of glands, etc. After diagnosis of parotid cancer, the side effects of radiotherapy for parotid cancer will be more or less serious. After being diagnosed with parotid cancer, you need to go to the hospital as soon as possible to receive systematic treatments, such as surgery, radiotherapy, chemotherapy, etc. If the disease is not treated in time, it will be treated as soon as possible. If there is no timely treatment and the disease is allowed to develop, the patient’s life may be jeopardized.