Hi,
Why pain?
I always say of flexis they are so simple they are like shelling peas it is only afterwards it is like peeing shells!
Seriously I have had loads of flexi checks, several flexi ops without an anasthetic and several rigid ops with epidural.
Why do you get PAIN?
Something is wrong!
Either they are failing to use addequate lubrication as they introduce the scope or they are introducing it too rapidly in either case they will cause minor tears in the inner surface of the urethra - it they are too brutal they could also traumatise or damage the sphincture muscle between the urethra and the bladder.
There may be pain or serious discomfort as they burn the cancer away or during meat welding but usually the site is not on a nerve in the bladder which seem fairly well spaced! If it hurts as one knows exactly the cause - I find I can cope with the pain as a tradoff for going home in an hour
After the procedure yes it can be sore urinating, particularly after an epidural and rigid [well it is quite large

] After the cath has been removed it may hurt to urinate for 2 or 3 days but it sure beats having bladder cancer! Drink lots more water and keep flusing the system. If you can't cope then ask the urology department for a syringe or two of the antiseptic lube [whatever brand they use] You can then insert the dispenser into the urethra and administer adequate to coat the walls of the urethra before and after urination thereby reducing the 'peeing shells' effect and also acceleration of healing of the abrasions.
I submit my comments probably also pertain to BCG but having only had mytomicinC I can not comment accurately.
I have never had a urinary problem from urology treatment that lasted more than 3 days after cath removal.
Specifically to Rosemary, when you state pain in urination is this urethral or globally bladder pain. If the latter then I think the suggestion above may help, if the latter ask your urologist if you can have bicarbonate of soda PILLS as this reduces the acidity of the urine, which may help, as does drinking far more neutral [water] fluids.
I hope this helps.
Regards,
Greg L-W.