Radiotherapy has some damage to the liver. Radiotherapy has different degrees of damage to liver, because in radiotherapy, firstly, radiation has certain penetration, its ionizing radiation will cause damage to normal tissues before and after the tumor, and secondly, the irradiated area usually includes a small amount of normal tissues around the tumor, in order to reduce the possibility of recurrence caused by the spread of the cancer cells, so it is inevitable that radiation has damage to liver. In addition, the most common side effects of radiotherapy are bone marrow suppression, skin and mucous membrane damage, gastrointestinal tract irritation and other adverse reactions, which can be manifested as dry skin, itching, nausea, vomiting and other uncomfortable symptoms. Therefore, radiotherapy is a kind of treatment for tumors, but it can also cause some side effects. Patients should follow the doctor’s instructions and standardize the treatment according to their own conditions, so as to minimize the side effects of radiotherapy.