The cause of very itchy anus after radiotherapy for cervical cancer is mostly due to radioactive dermatitis caused by radiotherapy. Cervical cancer is a common malignant tumor of female reproductive system, and the occurrence of the disease is mostly related to factors such as heredity and unclean sex life. Radiotherapy is one of its main treatment methods. Due to anatomical factors, it can lead to the side effect of radiodermatitis in neighboring areas. Itchy skin in the anus is one of the clinical symptoms of radiation dermatitis. In severe cases, skin breakage, infection, burning pain and other symptoms can occur, even affecting sleep and walking. At this time, attention should be paid to this area to do a good job of protection, such as keeping the anus clean and dry, pay attention to maintain hygiene, avoid the use of soap and other irritating substances, avoid scratching and so on. If there is persistent discomfort, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to actively treat, so as to avoid delays in the condition.