Radiotherapy is used for many diseases, and kidney cancer is no exception, and radiotherapy has some effects on the health of patients. The reaction of kidney cancer after radiotherapy can be local reaction or systemic reaction, and the following will explain the symptoms after radiotherapy. Dry skin patients often feel itchy skin, and skin surface pigmentation or even peeling starts to appear as permanent light brown spots. For patients with wet skin, eczema or blisters may appear on the irradiated area, and severe patients may also suffer from vesicles or breakouts. Wuhan Fifth Hospital Comprehensive Cancer Treatment Specialist Long Zhixiong 2. Mucosal reaction Patients with light symptoms may have redness and swelling of oral mucosa, oral congestion, redness and swelling of cavity, and secretions also start to decrease. Patients have symptoms of dry and painful mouth and decreased appetite. Moderate patients may have marked congestion and edema, as well as spotted white membranes and even ulcer formation, making eating difficult. In severe cases, the oral mucosa has erosion, obvious bleeding, white film, increased ulcers, purulent discharge and inability to eat. The systemic reaction of patients with this disease can be characterized by functional disorders or even dysfunctions, a decrease in appetite, depression, weakness and fatigue, frequent nausea and vomiting, and feeling full after eating. Although radiotherapy may cause some side effects to patients, after all, there is no perfect method, so we can only try our best to reduce patients’ pain and suffering. The basic symptoms of kidney cancer after radiotherapy. There are inevitably some side effects when treating kidney disease patients, but we should not veto this treatment method because of the fear of these, after all, the advantages outweigh the disadvantages. We should observe the reactions of kidney cancer after radiotherapy carefully to minimize the pain and suffering of the disease.