There is not a lot of information available about how many anal cancer thrivers develop radiation enteritis, although from our experience talking to thrivers, caretakers, and medical providers, a high proportion of thrivers who undergo radiation therapy will develop at least some of the symptoms mentioned above. A lower fiber diet may help reduce symptoms during this time. Ask your doctor about the specifics, and if this diet is right for you. This swelling is caused by a buildup of lymph fluid ...