### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My father had prostate and it is diagnosed  that it is cancers and was operated 10 years ago the doctor told that he has removed the cancer but could not operate the prostate because of come complication .After the operation the doctor under gone Cystoscopy test every year for  5 years after the operation and found no sign of cancer reformation after 10 year he has urinary infection with temperature he took antibiotics and also ultrasound was conducted and found that a little enlargement in prostate is there doctor advised to take medicine as there is not significant enlargement of prostate .After taking medicine he was cured and urine test it is found the inflection is gone and now after 20 day he has again have urinary infection can u please give me the reason ?

### output:

Your father does have enlarged prostate which is causing mild to moderate urinary retention which means they when ever he passes urine some amount of urine stays in the bladder due to enlarged prostate and that stasis of urine in the bladder causes urinary tract infection as urine is excellent media for bacterial growth would advise you to get his PMRV done which post micturition residual volume on which he will get ultrasound scan with full bladder, and then he will be asked to empty his bladder and again scan would be done to see how much urine stays within the bladder if it is more than or around 100ml that's significant. I would advise you to get his urinary tract infection treated by antibiotic and after that start him on tamsulosin 0.4 mg once a the before going to bed this will help him to empty his bladder completely avoiding any further infections.