Radiation proctitis is a complication of the rectum that occurs in cancer patients after radiation therapy, and may be manifested by frequent blood in the stool, abdominal pain, diarrhea, and so on. Radiation proctitis is commonly seen in women with gynecological malignancy or men with prostate cancer after radiation therapy. It is because radiation therapy will cause damage to normal tissues and organs while killing cancer cells, especially to the rectal mucosa, resulting in radiation proctitis. Radiation proctitis often manifests as lower gastrointestinal bleeding symptoms, such as blood in stool, mucus-pus-blood stool, etc. Long-term blood in stool may lead to anemia in patients. In addition, due to the consumptive nature of cancer itself can also lead to malnutrition or even anemia to varying degrees. Radiation proctitis can be controlled by medication, but cancer radiation treatment is more than once, even if the radiation proctitis is temporarily relieved, it will recur due to the next radiation treatment, so the symptoms can only be relieved by adjusting the diet or medication. It can be gradually cured after the end of cancer radiation treatment.