My mom is 95 years old and has just been diagnosed with rectal cancer. She has no symptoms and no pain. They are planning on starting radiation in a week or so and also having her take chemo pills. My concern is her ability to withstand the treatment and how sick will she be get from the treatment. They advised the mass will grow and she won't be able to have a bowel movement, so that is why she is accepting treatment. What are the side affects of the radiation and chemo. She is in good helath otherwise.