There isn't a recognised link between IBS and hormone therapy. There's even been some research on it:
Association between ischaemic bowel syndromes and androgen deprivation therapy in patients with prostate cancer: A retrospective cohort study
That's not to say it's definitely not related, but there was no statistically significant link in the data.
What you definitely should consider with IBS is the use of a rectal spacer while having the radiotherapy, such as SpaceOAR. This pushes the prostate and rectum apart, so that achieving max dosing at the prostate edge doesn't also deliver that dose to the rectum. It can be used with either brachytherapy or external beam radiotherapy, and if you came under the UK NHS, you might be able to get it on the NHS as an IBS patient. Not all hospitals have surgeons skilled in doing SpaceOAR though. It's currently not recommended in high risk cases, but you haven't indicated that's the case for you. Brachytherapy will deliver less dose to the bowel than external beam radiotherapy. There are two types of brachytherapy, permanent seed or LDR (low dose rate) where radioactive seeds are placed inside the prostate and generate a dose for around 6 months until they wear out (although they stay there permanently), and temporary or HDR (high dose rate) which uses a single seed which is put inside the prostate and delivers its dose for about 10 minutes before being removed again. The HDR procedure is normally done twice 2 weeks apart, but that's not common in the UK. In the UK, HDR is usually given as a single session, and the other session is replaced with a reduced dose of external beam radiotherapy (called HDR Boost), which would not be so suitable in your case.
Edited by member 14 Sep 2020 at 16:04
| Reason: Not specified