Question: what are the long term side effects of brachytherapy?
Answer: Bladder inflammation. You might feel that you have to pass urine more often than usual. ... 
Problems passing urine. ... 
Leakage of urine. ... 
Erection problems (impotence) ... 
Frequent or loose poo. ... 
Inflammation of the back passage (proctitis) ... 
Cancer of the bladder or lower bowel.