Urologist Inserted Larger Catheter

My urologist has a 22fr inserted into me right now (prior to this he would use 18fr or 16fr on me). I'm finding it much more noticeable but rather enjoyable.

Any doctor, nurse, or anyone able to give any insight as to how they select a catheter size to insert into patient? Or reasons they might insert a larger than normal catheter?

I believe that a larger one is used if the smaller one was passing urine, even when the balloon is over inflated.

I may be wrong.

The most common reason to use a larger catheter is to prevent clogging or obstruction of the catheter by blood clots from the bladder or clogging by the encrustation caused by infection or colonization by certain bacteria. If there is leaking around the catheter, the most common cause of that is that the catheter is blocked and the bladder becomes overfilled. This would cause a great deal of discomfort or autonomic dysreflexia in someone who has reduced sensation in the bladder for many reasons (e.g. spinal cord injury, neurogenic bladder). Bladder spasms can also cause urine to leak past a catheter, but that is easily controlled by medications. A larger catheter might also be used to address bleeding from the urethra. For both males and females, 16FR or 18FR is the most commonly used sizes. Some doctors might go smaller because that was the common practice, but in my practice, I find that smaller sizes can move around too much in the urethra causing increased discomfort. I have some patients who are most comfortable with a 20FR, but too large a size increases the risk of causing a stricture which is something to be avoided.

Thanks @Deke for all of your catheter knowledge!