Fistulas--How to know if you have them?

As far as I know, I don't have any fistulas. But as I fight my second flare (for two months now) I wonder how I will know if I develop one or more? Since I can't look "back there" easily: Do they hurt? Are they obvious to the touch? Do they "seep"? I imagine fistulas to the bladder would be obvious, but inter-intestinal ones seem like they'd be difficult to know about.

Hi I had one from small to large bowel and also had a large abcess seemed they all were found about the same time.As far as knowing that it was there I had small bowel follow threw,and barium enenama .I don't know if there were signs of having them or not but did have alot of pain and blockages around that time. I had surgery which took out the bad sections . Of course if they come to the skin it is very noticeable and developed one after abscess surgery. lol gail