What problems caused in radiation of prostate cancer?

It depends: Some men have no trouble with radiation to the prostate, either external beam or radiation seeds, but others will have trouble with pain on urination or difficulty with urination.

Early & Late Issues: Prostate radiation has typical side effects. For external beam, some skin irritation, fatigue and irritable bowel/bladder problems occur initially. Later, though rare, bleeding from the bladder/rectum, urge incontinence or bladder cancer are the most severe risks. For radiation seeds, increased difficulty with peeing early on and bladder or bowel urgency/frequency/burning later occur (less severe).