Redness and swelling of anus after radiotherapy can be treated by taking warm water sitz bath and applying hemorrhoid cream. Redness and swelling of anus after radiotherapy is a common side effect of radiotherapy for pelvic tumors. Generally, there is no discomfort in the early stage of radiotherapy, and the redness and swelling of anus is easy to appear in the late stage, which is mainly due to the edema of local mucosa caused by radiotherapy. At this time, you can take a warm water sitz bath, the water temperature is generally controlled at about 40 ℃, sitz bath time is 5~10 minutes. At the same time with the application of hemorrhoid cream, redness and swelling can be relieved. In addition, the usual diet should pay attention to try to eat some light and easy to digest food, such as tofu, soy milk, milk, fish, eggs, etc., and to ensure the intake of fresh vegetables and fruits, to ensure that the bowel movement is smooth, to avoid smoking and alcohol, to avoid spicy and irritating foods such as chili.