I had a colonoscopy a little over 1½ years after radiation. Because I have stage 4 cancer, the doctor (proctologist?) scheduled an appointment with me beforehand to make sure I was up for it, but had no qualms after we talked. The colonoscopy confirmed that I have some (probably permanent) radiation proctitis, in addition to the radiation cystitis, but the proctitis has almost no impact on my day-to-day life other than occasional burning or mild stabbing pains.